DECEMBER 30, 1893.]
rr:
I
C:;
Air drYi� apparatus, G. P. Schneider ............ . 511,217
Air warmmg furnace,J. Schill et al... ............. 511.16i
Alarm. See Leak alarm.
Amusement apparatus, R. S. Hughes .............. 511.272
I
regnlate themselves in arc lighting where the lamps are ,growth
converted the pond or swamp into a peat bog.
Awning, W. Bennett.................. . .......... . ... 510.881
I'M /large jar insertion under this headisOne Dollar a tine
connected up in series. Now, in arc lighting, as I under· I There are many such examples in Europe and America. Bag. See Traveling bag.
jor each insertion; about eil)ht word s w a line. Ad't1era
stand it, as the resistance is lowered by turning out 80me : Sound cedar timber is now mined from ten to twenty feet Band t;utter and feeder, .J. W. Kinross........... . 511,242
tisements must be received at publica[ion office as earlv as
r
lamp., the voltage fall s ; and in incandescent lighting, below the surface in the swamps of Southern New �:!;�r�i. a�j�s��gf! ��i��'�:"C.·H. Brown.......... 511.318
7"hursdall morning to appea.rin th e joilowir.O week's issue
I
Bearing, ball. A. Winton............................. 511.228
when the resistance is lowered by turning on some lamps, ! Jersey.
Bedstead, folding. T_ Adams ........................ 511.230
.
the voltage remains the same and the amperage increases. ;
, U. S." metal polish. Indjanapolis
Samples free.
(5631) R. W. C. asks for a formula for ����t�a1;t�!Rig�i �e�b�tevenson ................ 511.282
'
and
the
the
in
the
case
change
W
does
one
y
voltage
.
.
.
b
Wood pulp machinery. Trevor Mfg.Co Lockport, N.Y.
compu�mgthe number 0: pounds pres�ure a boiler :111 Bicycle attacbment, W.C. Moore................. .. 510.924
'
remain the .arne as the resistance of the ex.
Bicycle gearing.C. A. Snider........................ 511.169
The exhIbit of Wm. Jessop & Sons bas received the amperage
stand, if ou know the thICk ness of the Iron an� th SIze Bicycle roller sprocket. R. J. Godbery .............. 011.012
�
!
terual circuit falls 1 And in the other does the amperage
.
highest award atChicago Exhibition.
of the bOIler. A The J;lUrstI� g strength of a b�iler IS the Bicycles, etc.. mechanism for automatically opeat§�� ���:rdl,y��able saddles of. R. W. Riess.. 510.993
.
Steam pressure regulators, reducing valves, safety chan<-e and the voltage remain the .arne, the resistance of th.'�. .kness of th e I:�on or st]
] - Bin�
ee m d eClmaIs o f an mch ,mu
the field magnets being the same, since the dynamo in
.
checks. Foster EngineeringCG Newark. N.J.
tIp led by ItS tensile strength, �m s the per cent of lo�s Bind er, self, .J. M. Lawrance ........................ 511,243
�
Bit. See Bridle bit.
Light machinery, patterns, tools.models, and experi- both cases is self-regulating. according to "Experimental 0 : strength by the met hod of rI�etmg.
The pro�uct dl- Blind slat fastener, J.C. Stevens .................... 511.000
Science" 1 A. Supplying lamps in parallel, a shunt.
mental work. Waite Mfg.Co., Bridgeport,Conn.
v� ded b one-half the mternal diameter o� the bOl�er. A Block. Bee Paving block.
Block shaving macbine. Schraubstadter, .Jr &
!
.
The Improved Hydraulic Jacks, Punches, and Tube wound dynamo will regulate itself tolerably well, if the slngle-rlv
Scbilling, ........................................, 511.277
ted shell, With the best proportIOn of size and
�
armature resistance is low. It is especially adapted for
.
Blowing engme, W. E. Good ................... ... .. 511,013
Expanders. �. DUdge�n, 24COlu�bia St., Ne� York.
pItch of rIvets, may be rated at 60 per cent of the value Beard. SeeChess and checker board. Drygoods
series lighting. It is more sensitive to irregularities of
.
, Screw machmes, mllhng maclnnes. and drIll presses.
b
of the plate; a double-riveted shell at 70 per cent. For
I'be Garvm Mach.Co Lan,bt andCanal Sts:, New York. speed than 18 a series-wound dynamo. The action of- example, a double-riveted boiler. 48 inches diameter. five- BOdt�\'.:U�l. �fOa�'t(i. w:�d........................... 510.943
shunt-wound dynamos is best studied from their charac
r
,
.
e
Metal spInnIng, nICkel platIng, brass .castIng�, e:x:perI- " teristic
sixteenths inch steel plate of assumed 60,000 pounds ten- �gll��·c� �e� 8�W�·scbmid:·.·.·:.·.:·.·:::.· :::·.�� ��� tli:MJ
Examples are given in 'fhompson's
Bookbinder,J. B. Jobn.ton ..... ..................... 511.082
curves.
mental brass works. S. Newman. 64, Mam
St.,Cm'tl, O. I
0"31 X 60,000 X 0'70
Bookcase and washstand, combined, L. Hennes.. 511.237
.
.
ynamo had its
Boot.N. Herzog ......... . . . . ... ...... ............... 511.141
sile strength, the figures Will be ------Centrifugal Pumps for paper and pulp mills. Irrigating .. Dynamo-Electric Machinery." 6. If a d(bemg
.
.
eXCited
sn
24" .
and sand pumping plants. Irvin Van Wie, Syracuse, N. Y . field magnets. always of the .ame strength
.
�gm� �a':,�\'i,�t,f�;Il!: �gfe�; : ft"��ii.;r. : : :: ::::. m:�
from some dIfferent source), and was run at a perfectly 542 pounds, the ultImate strength of the boiler. The Bottle stopper.J. Brooks . ....... .......... ... . . ..... 511,0U
Magical Depot.
should be one-sixth, or 90 pounds. Bot
i
i i
s
a
r
Send for free catalogue of trIcks for parlor and stage. nniform speed' would a change of the resistance of tbe .afe working pressure
i�: W�¥� �����:g ��{:�� ��t� �::fl:��;�e! t
external circuit change the voltage 1
A. The voltage
T. Ferguson ....................................... 511,267
(5632) C. 'V. -Catgut is made by scrap- Box.
28{ Asylum St., Room D, Hartford,Conn.
See Folding box. Paper box. Resistance
box.
Emerson, Smith & Co Ltd., Beaver F'alls, Pa will would be constant. 7. Suppose we charge a storage bat- ing the entrails of sheep. twisting them while stretched,
Brake. See Air brake. Car brake.
Bend Sawyer's Hand Book on Circulars and Band Saws tery thus: The whole resistance of circuit is 15 ohms. and holding them so until they are dry.
Brake piston indicator, W ..J. Devers............... 511,0(6
At its end is a storage cell with terminals M and H. By
free to any address.
sboe.J. T. Hall................................ 511.298
(5633) J. R. asks: 1. A test suitable to Brake
Brick kiln.J. Gafnf ey ... ......................... . . ... 510,967
Split Pulleys at Low prices, and of same strengtb and Ohm's law (I. H 1 ampere would pass ; but since C01R make before an audience to demonstrate the existence of Brick
mould,
C. A. Sbultz ....................... .... 511.098
i!
F
between
M.
is
E.
H
poteutial
V
t
and
the
M
"
appearance as Whole Pulleys. Yocom & Son's Shafting
Bridle hit. E. R.Cahoone. ........................... 510,890
Brusb bolder.J. R.Colfman..................... .... 510.892
(t· 2 n ; but k of a volt is not enough to overcome opium in cigarettes. A. Try treatment with boiling alco­ Brush,
Works, Drinker St., Pbiladelphia. Pa.
metallic. E. E. Rice .......................... 511,002
i and application of the ferric chloride test to the illThe " Olin" Gas and Gasoline Engines, from 1 to 10 the voltage of the storage cell. Hence it would not ho
Brush mounting, P. Louchet ........................ 511,152
tlate. This gives a dark blue color. 2. Is it probable Buckle, W. F. Peet.. . ................................. 510.987
horse power, for all power purposes. The Olin Gas En- charge. Please show me where the mffitake is in the
Buckle
and snap. W. H. Pugb ................. .. . ... 511.310
I above conclusion. There must be one somewhere. A. that there would be enough arsenic to detect by Marsh's Bung. self-ventm!<.
gineCo., 222Chicago Street, Bulfalo. N.Y.
H. W. Stone........ .. . 511.005. 511.101
easily try it. Bung. vent. H. W. Stone ................. ............ 511,102
It
can
A.
1
You
apparatus
doubtful.
i8
voltages.
electric
you
an
opposed
with
treating
In
circuit
Perforated Metals of al! kinds and for all purposes, i
zinc and acid in making the test. 3. Burner. See Oil burner.
pure
chemically
Use
from
the
take
voltage
and
less
the
greater
the
subtract
i
Butter worker,C. Owens............................. 511.27i
general or special. Address, stating reqUirements, The
for holding money, coupons, etc., W. F.
Harrington & King PerforatingCo.,Cbicago.
! remainder as the net or actual voltage. The rule you cite Is it injurious to health to sleep in a room with a coal fire Cabinet
Beck .." ............................................ 511,231
applies only to actual resistdnceof a circuit through which burning in an open front stove 1 A. Notif the stove has Camera. See"Photograph camera.
Send stamp for circular of castings and parts of the
. ..
c
a
a proper draugh t. 4. Is it true that the top portion of a
dynamo-motor advertised on page 336, Scientific Ameri­ a current is passing. Counter-electromotive force cannot buggy
8:��rn�i ��tg{�1�� ��lr:rf&�·t������·. :... . . ':. gl�:�
wheel turns faster than the lower portion 1 If so, Candle sbade bolder, W. E. P. Frencb ..............
be treated as if i t were resistance.
510.907
can. Elbridge Electrical Mfg.Co., Elbridge, N. Y.
Candy working-machine, P. J. G. Firebau ......... 511,011
why does it 1 A. See, our SUPPLEMENT, No. 706.
Car brake.J. Donovan............ . . ................ 511,198
The best book for electricians and beginners in elec­ (5626) J. P. G. writes: 1 In SUPPLE­
coupling, I. L. Brown............................ 511,0(2
triCity is Experimental Science," by Geo. M. Hopkins. MENT, No. 641, on page 10240. in second column, you gIVe
(5634) W. C. asks: 1. What determines Car
Car coupling, J. H. Brown ........ .................. 511.233
Car coupling, S. C. Brown ............................ 511.117
By mail� $(; Munn & Co., pubJisbers. 361 Broadway, N. Y. No. 18 wire for armature. and on next page, last column, which is the positive pole in a thermo-electric pair 1 A. Car
coupling.S. L. Denney .................. ........ 510.903
Car coupling. W, F. Donnell ............. . ........... 511.073
Patent Electric Vise. What is claimed,is time saving. No. 16 for .ame. Which size is proper 1 A. It should The relations are determined by trial There is no uni­ Car
coupling.
J. f'. Scott .....................511,273. 511.279
read"
No.
18"
for
armature
coils.
2.
Is
wire
to
be
sin­
ver.al
rnle.
and
the
thermo-electric
relations
of
metals
are
No turning of handle to bring jaws to the work, simply
Car coupling, G. W. Smillie ................. . ........ 511.220
one sliding movement. Capital Mach. Tool 00., Auburn, gle or double wound 1 A. Single wound is more com­ different at different temperatures. 2. What two metals Car coupling. E. W. Woolley . ..... .................. 5m9i9
Car fender, street.W. B. Miles . ............... .. . .. 510.922
N.Y.
pact. You may use either. 3. Couldmotor be connected give the greatest current 1 A. Bismuth and crystallized Car. band,C. Roberts .. . .. ...... ...................... 511.211
Car sanding device.J. R. Dougberty . .. ., .......,., 511,199
Competent persons who deSIre Q.Ilencies for a new to some power and give .atisfaction, .ame as run with antimony at ordinary temperatures. 3. Does the E. M. Carding
engine fiats, method of and machine for
popular book. of ready sale, with handsome profit.may battery power 1 A. Yes; as a motor. It is not adapted F. depend upon tbe number of pairs in series, or upon
d
C
hing to, A. Hitchon ........,. 511,146
apply to Munn & Co., SCientific American office. 361 for use as a dynamo. 4. How many revolutions is the the intensity of the heat applied 1 A. On both. 4. Is Cas�� sr��\��� c;;!��
Cash
register
and
indicator.
H.Cook. ...... ........ 511,070
Y
Broadway.New ork.
armature required to make 1 A. As a motor, this regu­ there any varnish not affected by boiling water? A. We Cash register and indicator, Tyrrel & Aufuldish . 511.257
Casting
apparatus.
J.
H.
Cornelison
......... .. . .... 511.265
lates
itself
by
the
power,
.ay
1,000
to
2.000
per
minute.
can
give
no
reliable
fOrInula.
!llr'Send for new and complete catalogue of SCientific
Casting beads on spigot ends of iron pipes,
metbod of and apparatus for. P. McArtbur .... 511.2i7
and otber Books for sale by Munn &Co., 361 Broadway, 5. How many 16 candle power incandescent lamps would
(5635)
D. W. R. writes: We have a dy­ Casting metals, centrifugal apparatus for.I.J. L.
the above motor run 1 A. None.
NewYork. Free on appJication.
Sebenius . . . ........................................ 510,995
namo (5 K. W.), 10 5 volts. Could I connect it so that I
for propelling boomerangs, C. W.
(5627) C. S. asks how to make a dry could weld iron or " burn" sheet lead 1 If so, how shall I Catapult
Renear................ ...... . .. .................... 510.936
cell. A. See our SUPPLEMENT, Nos. 157 and 767 ; also proceed, or where can I obtain information regarding it 1 Centrifugal ventilator.C. G. Herscber ............. 511.liO
(,bair, T.J.Collins.... .. .............. ............ 511.195
the SCIENTIFIO AMERICAN, vol. 61, No. 20. and vol. 67, A. Your dynamo is of far too high resistance for incan­ Charts, convertible case and display stand for.N.
W.lMackey ....................' ................ 511,089
No.2.
descent welding. The usual way of operation is to em­ Chess and checker board.C.C. Moore.............. 511,306
(5628) E. F. asks: 1. What must be the ploy an alternating current dynamo and to convert the 8g:�: �:�e�:��:.·:.·.·.·::.·.·.·.·.·.·,·.·,·.·.·.·.·.·.·::.·..... ....... :.: gH:�
current into one of higher intensity. W e refer you for Cigar wrapper cutting machine, Storm & Warnessential difference between an arclam pdesigned to burn
ken................................................. 511.001
on a constant potential circuit and one designed to burn full information to our SUPPLEMENT, Nos. 891, 892, 763, Clamp. SeeColter clamp.
ruNTS TO CORRESPONDENTS.
68�, 785, 778, which we can supply at 10 cents each by Clasp, J. M. Kaiser.................................... 510.918
on a constant current circuit 1 A. The constant potential
NalDe!! and Addre!!!! must accompany all letters.
mail. Our SUPPLEMENT, No. 840, describes the Ber­
Chiiie: . 'G: 'iioih'� 511,125
8�tt�e��
o��T��i��d�h�n�..?;:��
or no attention will be paid thereto. This is for our lamp must have a resistance coil in series to steady it.
holz .....................
......................... 511.216
The constant current lamp must have an automatic cut­ nardos system of using the arc. 'fhis would operate with
information and not for publication.
Clotbes line holder, H. Pittman................... 510.991
ReC"rence!! to former articles or answers should out, so that if one lamp goes out it will not open the cir­ your machine.
Clotbes press, H. A. Shepard........................ 511,097
give date of paper and pailc or number of question.
C1utcb.H. Broome .. .. .... ..... .. . ....... ..... ........ 510,886
cuit.
2.
With
what
is
almninum
combined
in
its
natural
(5636)
G.
A.
G.
asks:
1.
Can
I
draw
Inq Ilil-ies not answered m reasonable time should
Clutcb. J. Gawron .................................... 511,047
be repeated ; correspondents will bear in mind that state, and how may I obtain some of the ore 1 A. WIth electricity from a storage battery and use it for heating in Coin sorter and ejector. E. E. Mattson ... . . .. ...... 510.982
and process of manufacture, wood hors e,
some answers require not a little research, and, oxygen generally, in all clays, and earthy minerals in
welding and s ",elting iron and minerals, and how shall I Collar
B. A.J. Block .... , ............................. . 511,198
though we endeavor to reply to all either. by letter
Colter
clamp,J.Clayton .......... .................... 511.123
general;
with
fluorine
in
cryolite.
3.
Has
ammomacal
proceed 1 A. A storage battery may be used for welding,
or in this department. each must take his turn.
Combing fibrous materials, machine for, Donisalum ever been obtained by the direct combination of but is not to be recommended A proper dynamo, with
Bn e
to
C
S
C
0
thorpe & Burrows ................................ 511,128
fu :.,� ���:�s Jil{ � iu�ls�� �t't !d'd��;��:� ammonia, sulphuric acid, and almninum 1 A. No; except converter if neces.ary, is better. It can be used for Combing or spinning, machine for preparing
fibers for.Domsthorpe & Burrows.............. 511.129
houses manufacturing or carrying the .arne.
bi
Special Written InCorHlalion on matters of possibly as a chemical experiment. 4. If it has, please smelting by using electric light carbons for terminals
. .�����::::::: : :: : ::: tU:lil
personal rather than general interest cannot be tell how. If not, would the combination be of any value 1 leading into a mixture of the ore with coke dust; but it 8b::'le'::.sB'i:�'t': � �';;t�e�: �
Cooler.
See
Wine
cooler.
expected without remuneration.
A. Dissolve the aluminum in hydrochloric acid; evapo­ will be expensive. 2. Is the storage battery patented, Copy holder.L. Hirt ......... ...................... . .. fi11.li5
Scientific Alneriean SnpplelDents referred
rate with sulphuric acid until all hydrochloric acid is ex­ and where offered for sale 1 A. There are patents affect­ Copy holder, W. E. younger....................... 510.950
to may be had at the office. PrIce 10 cents each.
Copy holder and tablet.combined, B. F. Stuart ... 511.032
Book!! referred to promptly supplied on receipt of pelled; add requisite amount of acid, if neces.ary, and of ing different features. Address Queen & Co., whose ad­ Cornice, T. E. Denegar . .......... ................... 511,197
Coupling. SeeCar coupling. Thill coupling.
price.
ammonia, and crystallize. There would be no object in dress you will find in our advertising columns. 3, What Cradle.automatic G. Denegri....................... 511.127
Minerals sent !:or examination should be distinctly
carrying out such a procells.
kind of dynamo shall I use for storing this electricity 1
marked or labeled.
8�m�:�g�: �r�' gog�nI1ousiori:.::::·.::::::·:::::::: �lg:���
Cultivator. wbeel. W.C. Moore..................... 510.923
(5629) W. S. D. wr ites: The recent ap- A. Use a dynamo giving two and one-half volts potential Curling
iron, self-beating. E. E'ontaine............. 511.297
(5624) G. A. M. asks (1) for a compound plication of electricIty to canal boats is regarded as a for each cell that is to be stored. Charge at the rate Cutter. See Band cutter. Tobacco cutter.
Dado bead, G. W. De Grasse....................... . 510.961
with which to coat wood and metals so that they will re- great invention.
Now, it has always been stated that specified by the manufacturer of the battery.
Dental forceps, H. Walter........................... 511.007
Dental band piece.C. M. Spencer ................... 511.029
sist the action of the acide such as are used in batteries. steam could never be used as a motive power on canals for
(5637) C. H. McD. writes: 1. I ha ve four Dentist's
device for saving gold filings, A ..J. &
A. Paraffine wax or thin sheet gutta percha. 2. Would the reason that the banks were undermined and ruined
F. F. Doud. .. . ........... .......... ............... 510.963
storage batteries running a 4 candle power lam p of 6 volts.
Desk
and
copy
holder, combined, Stuart & Willit be practical to make a Gramme ring motor as few as by the wash of the swiftly moving boat. Could you.
At times the lamp grows dim and then brightens up
son............... .. ................................. 511.031
four coils,and would i t have any advantages over one throughlyour paper, kindly explain to me and several
again; what is the cause of the batteries acting s01 A. It Desk. scbool. G. A. Bobrick.......................... 511,262
o
with a Siemens armature 1
A. You can do this; but it others why the wash of an electric canal boat, moving at
. P: 511,189
is impossible for us to tell where the trouble is. If the bat­ ��:�l�:���i��� ���P�f�ht-ris�'l���� �rc:,'·C··
is not advi.able, and wonld not be better than a Siemens the rate of eight miles an hour, would be any less ruinous
Burcb, ............................................ 511.26i
tery is a good one, it should give ample current. 2. Can
drum armature. 3. Is there any .alt of mercury which to the banks of the canal than the wash of a steam canal
you give me approximate amperage of these cells, each i:::WI;ld����t�M�'ld;;��:�:: :: : ::::::::::::::::::: �iUW
can be put into the battery solution to keep the zincs boat moving at the same rate of speed 1 Both boats. of
Door and key fastener, D. H. Livingstone......... 511.022
cell having four plates, 6 X8, covered with red lead paste1 Door cbeck, J. Speirs.... . ............................ 511.099
amalgamated 1
A. Mercury nitrate.
4. Is there any r course. to have screw propellers. A. The mode of pro­
l
il .
A. About four amperes, if the cells are in good condition.
simple way of finding the number of revolutions of a I pulsion does not affect the wash on the banks of a canal.
Bgg� �;ri�:�'J� b�rtfmid.�:.� . �.��: ::::: :::::::::::. �n:�
We imagine they are not. from your trouble with the Door spring and check. Larsson & Brouillard .. .... 511,299
small motor or engine 1 A. Attach a sharp-pointed pen- Stern and bow wheel propulsion was tried on the Erie
lamp. Perhaps they are not fully formed. 3. I have a Draught equalizer. S. A. Holt. . . ......... . .. .. . . .. . . 5Hl,971
Drill. See Rock drill.
cil near the axis of rotation. Move a piece of paper Canal as early as 1833, and was then declared inadmiss­
No.3 Knapp motor. taking from four to ten volts. What Drilling machinery. M. Beal....................... .. 510.�BO
mounted on a board in front of the pencil. Keep i t mov- ible on account of the wash. The Baxter system of screw
is required to change motor into a dynamo 1 A. No Drum. M. E.Con verse, ................. . ............ 511.126
Drygoods board, G. Tetreau ......................... 511.175
ing steadily for five or ten seconds. Then count the propulsion began about 1870, in which speed was sacri­
change is neces.ary. if the field magnet core is of cast Drying apparatus, D. W. Anderson.... . .. ..... . ... 511,184
turns in the spiral. Some one may time you while you ficed to .ave the banks, four miles per hour being about
iron. But a small motor is apt not to gIVe much return Dumping platform scotching device.J. S. Kictd ... 511.021
Eaves trough hanger, W. Baynes....... ............ bl1.U35
move the board.
the average, while six to seven miles could be made by
Ecraseur, Haussmann & Dunn . . . . . . ..' ............. 511,202
as a dynamo.
Edging macbine, double, C. B. WesselL .. .... ... ... 511,R12
(5625) E. R. W. asks: 1. Please tell me. the .arne boats between NewYork and Albany. B. T.
�==-.
.
.
I Babbitt built an experimental boat to overcome the diffi��:gt�i� :it�;y�g�i��r;;:E:POPpo�iisc'h:::: � :�'.: �n:n�
ru:actly how the r�Slstance of commerCIal German Silver I culty by jet propulsion. taking in the water at the bow
Electric elevator. F. A. Perret........ , ,., , ...... 510.932
TO INVENTORS.
that of pur copp r. A. Ge
n
re c0 par s WI
Electric machine brmlh holder, dynamo, F. E.
�
�
,,:,
m.
�
�
��
and discharging at the .tern. It did not meet expectaAn
experience
and
of
forty-tour
tbe
preparation
years.
Averill............................... . ... .......... 510,952
silver varIes In re81stance accordin� to Its compo81tion.
tions, and the scheme was abandoned. No matter what of more than one hundred thousand applications for pa- Electric motor, O. F.Conklin...... .... .. ...... . . .... 511.1\l6
d b
h
If you us the factor 12 or 13, you will not go far wrong.
Electric motor brush holder, Robison & Perkins.. 011,214
�
kind of power is used, the speed of the boats, if made for i���Saa:d ���tr� o� ���%, ;�����nUt�, ��JIfg���:e�� ��� Electric motor band regulator. W. D. Packard .... 511.157
2. What IS the rule to find the number of ampere turns
.
A Electric regulating switcb. E. A. Barber ........... 511.187
carrymg the great est buIk must conf rm t0 the h ydraul'IC equaled facilities for procuring patents everywhere.
�
, synopsis of tbe patent laws of tbe United States and all Electric switcb, J. L. Hinds ....................... ... 511,240
required to get a I(iven lifting power from a given magnet
.
condition of the canal. Depth and w�dth are the all-Im- ; ���1i:� ��& ii� n:� � b a� O ���ll� \\�n ��� g���� Electrical co necto F. G.Curtis................... 510.898
core, allowing for distance of the coils from core? A.
� � e
� e E
.
r ng f �a
Electrode forn voltaicr, cells. E. B.Cutten ....510.901, 510.902
portant exponents of speedy tranSit on our mternal
abroad. are invited to write to this office for prices Electrodes,
adjusting the jOints of carbon, E. B.
There IS
' no g neraI rnle. It all d epend s on the shape,
�
waters. We have seen the light draught, sharp-lined which are low, in accordance with the times and our ex.
.
Cutten.................................. ............ 510.899
material, and dImenSIons of the magnet core. The caltensive
facilities for conducting the business. Address Elevator.
Electric
e l ev ator .
packets 0 f the old en t'Ime drawn at the speed 0 f a fuII
i)'
ce SCIENTIFIC AMERICAN.361 Broad- Elevator.F. E. Herdman
..................510.913 to 510.915
!�Uy.N e� f�rkoffi
culations must take leakage of lines of force into account.
.
.
.
.
.
trot With mne horses, or at eeven miles per hour With
Elevator belts. means for driving, D. A. Robin:
We refer you to Sioane's" Arithmetic of Electricity."
.
son ....................................... ........... 511.212
the waves curlmg over the tow path. bu� destr�ctI:e to =======� Elevator rope drive, D. A. Robinson ................ 511213
$1; Thompson's "Electro-magnet," $1; Thompson's
Emery wheels, tool for dreSSing, G. \V. Kamerer.. 511,083
the ca�aL If ever an average speed of elght �iles IS ac­
"Electro.magnetic Machinery," $6. These we can sup.
See Blowing engine. Gas engine. LoINDEX OF INVENTIONS Engine.
omphshed on ollr canals on a commerCial baSIS of profit.
comotive engine. Rotary engine.
ply by mail. 3. If I have a storage battery with ten 6� ?
.
Engine attachment, gas, Barrett & Daly . .......... 510,879
It �ill be when the canals are 10 feet deep and 150 feet
X 4�inch plates,eachplate punched'fu llof )4 inch holes,
Engines, starting gear for compound. C. A. Ball .. 511.186
.
For whlcb Lenera Palent of tbe
WI e.
Engines, trunnior.. bearing for oscillating, C. E.
which are filled with red lead, how fast can I discharge it
Healy ........................................... ... 511.203
United
Stale"
were
r
a
n
ted
G
Engraving machine, A. M. English............. . ... 510,905
without injury; that is, how many amperes ean I pass
(5630) W. J. R. asks: How is it that
ExerCising
apparatus,C. K. Pickles ................ 511,251
through it. About how many ampere hours would it stumps of trees are found in the bogs of Ireland as far as
Exbibiting apparatus. D. W. Tower ................ 51l,10{
December 19, 1893,
Exhibiting device, Luubeck &CumminJ!s .......... 511,088
have? A. Allow six amperes per square foot of positive twenty feet from the surface, which look as if they had
Exhibitor and depository. shade, .1. DaehJer
510,960
plate; about six amperes for the battery. It should been broken off 1 I have never found anyone that coulll
i
���,. .�����I..�. :'���I. ��::::: glggl
have sixty ampere hours. 4. What would be its in- give me any explanation as to how they came to be so "'ND EACH BEARING THA'r DATE. 1;��l:��fs��E:�t��ii'.
Fence. N. McAdams . .......................... ...... 511.309
ternal resistance, the plates being separated about three- situated A. The tree stumps found beneath the .11rface
Fence. Rosbock & Band.............................. 511,063
[See note at end of list about copies of these natents.] Fence machine, wire, W. N. Parrish ................ 511,059
sixteenths inch 1 A. Almost negligible; perhaps one of bogs and swamps grew there in prehistoric times, be­
Fence posts, device for applying wires to, E. F.
one-hundredth ohm. 5. In
Experimental Science," fore the water was raised above their roots. Geolobtical
...
Pittman............................................ 510.933
e
d
se
Fender. SeeCar fender.
page 527, it .ays: .. The Weston dynamo is also perfectly changes in the level of the land have caused the water to ±�r :'�k���w� b e,"!�.���.���. .'. �'.�: .���:: :::: �l���i
r
adapted to incandescent lighting. With a constaUt;,peed rise or the land to settIe and cover the lower pan of lthe AIr compressor, U. De Laval . ..... .. .. ... ... . ...... 611,086 �1��.:;.� iFh���i::::::::::::::::::::::::::: EH;MX
the regulation of the cu
nt is automatic."
Just before
this it describes the way in which shunt,wo\lnd dynamos
trees. The part above the water de
ying, left the stumps
under water, which preserved them until the vegetable
c
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© 1893 SCIENTIFIC AMERICAN, INC