May 31, 1927.
-
W. E. COOKE
1,630,891
CLOCK
Filed Dec. 20, 1924
| N V E N T O R.
W///zaz Azºnes? Cooke
BY 2...a…o & /3…"
A T TO R N EY
- Patented May 31, 1927.
UNITED
STATES
PATENT
office.
wiTLIAM ERNEST CookE, oF sypney, NEW souTH wa? Es, AUSTRALIA.
CLocK.
Application filed December 20, 1924, serial No. 757,118, and in Autralia February 16, 192
This invention relates to an improved
clock in which the hands are automatically
moved to indicate apparent, mean, or stand
ard time by the act of forming an image of
5 the sun on a day chart. . .
.
The invention comprises apparatus for
indicating on an ordinary clock dial the
correct time during sunlight hours for
every day of the year, for determining
.0 and indicating the geographical meridian
through the clock's station, for determining
the true geographical bearing of any loca
principal : gear . wheel 24 , is - secured
pointer 27 in the form of an angle bracket
frame. A member 28 of the pointer is
pierced with a pin hole 29 (Fig. 4), and a 60
parallel opposite portion 30 of the pointer
is provided with a day chart 31 (Fig. 3) the
central
a? point 32 of which is perpendicularly
opposite the pin hole 29,
.
.. .
.
The names of the months are set out on
.
65
the edges of the chart, and the days of
each month are indicated by their respective
numerals and by short dashes 33 on the
curved
graph 34 which represents, the an 70
tion
within
view
of
the
clock's
station
as
distinguished from the compass or magnetic
displacement of the sun from its 7
15 bearing, for determining the latitude of the gular daily
#.
equation,andof
clock's position, and for determining the
£or convenienceis—the
of illustration
time.
20
Fo
-
-
". .
time of sunrise and of sunset for any day to avoid overcrowding of the chart five day
of the year.
. .
..
.
only are shown, and each ten day
In the accompanying drawings — . . intervals
interval is indicated by its calendar numeral. 75
Figure 1 is a side ‘....elevation
of one form To set the equatorial plate 18, parallel to
of construction;
. .” - . . . . . . . . . . . . . . . . . . . . . .
front elevation of thef asame;
day
chart;
25 Figure 4 is an enlarged sectional eleya
tion through portion of a sun pointer;
the celestial equator three operations are
necessary (1) level the base plate 10, (2).
elevate
elevate tthe plate - 18- - to make - an angle ith
the plate 10, equal to the co-latitude. The
same result may be obtained by elevating
the axis of rotation 35 of the sun pointer to
Figure 5 is a sectional elevation
of another
nother an altitude equal to the latitude, (3) The
form of construct with the gearing and base plate
: must be.* rotated in a horizontal
. . . . ..
plane,
- until the plate
- 18
parallel to the 85
clock
dial
removed;
30 Figure 6 is a plan Qf the supporting means: celestial equator, and the axis of rotation
points to the celestial pole. Only when in
for
the equatorial plate hown in Figure 5; that
and
position will the sun’s image, formed
"Fig. 7 is a plan view of
* - " " -:
compass card
35
on graph 34 by suitably rotating the sun
on
. . . * * ra. -- "...*
* ~... " :
. . . . ."
pointer, always fall on the correct date 90
A base plate 10, provided with levelling mark. To obtain this position rotate, both
screws 11 and a spirit level 12, is mounted base plate and sun pointer, the former hori
on a base board 13 which is adapted to be zontally, the latter on its axis, until the
or dial used in connection with the device.
either permanently or detachably secured Sun's image falls on the correct date mark.
40
40
: - - When this occurs the axis of rotation must 95
. As shown in Figs. 1. and 2, the plate 10. be pointing to the pole, the instrument must
carries an additional plate 14 which is piv be correctly orientated; and the rotation of
oted on and is adapted to be swung laterally the sun pointer will have so moved the gear . . .
over the plate 10 and to be clamped thereto true
wheelsstandard
that thetime.clock
. . . hands will indicate 100
by means of a set screw 15.
to a suitable pedestal not shown.
“Pivotally mounted on brackets 16, 17 car
to set the clock for indicating local mean ".
ried by the plate 14 is an equatorial plate. time the base board 13 is placed on a pedes
18 which may be adjusted in vertical angu tal,in approximately the geographical me-
lar relation to the base plate and be clamped
at the desired angle on a support such as the
50 curved bar 19 carried by the plate 14. As
ridian with the clock dial 20 facing the south
in the Southern and the north in the North
ern Hemisphere. The screw 15 is loosened
the plate 14 may be moved laterally the and the base plate levelled. The sun pointer
-
105
equatorial plate 18 is capable of rotation in is rotated and the plate 14 swung laterally
a horizontal as well as in a vertical plane. over the plate 10 until the image of the sun
The equatorial plate
- 18 carries
- - a- clock
- dial falls on the centre line 36 of the chart; the no
55 20 and a gear train 21, 22, 23, and 24 con equatorial plate 18 is then adjusted in verti
trolling the clock hands 25, 26. To the cal angular relation to the plate 14 o o the
1,680,891
plate 10 until the sun's image falls on the the equatorial plate and controlling the and a sun pointer mounted on a
level of the correct date mark on the chart. hands,
member of the gear train.
Plate
18
is
then
clamped
to
the
bar
19
and
plate 14: adjusted laterally to bring the 2. A sun clock comprising: a base plate,
on the correct date mark. Screw 15 levelling screws on the plate, an equatorial 70
ºplate mounted for angular vertical adjust
s image
is then tightened.
The complement of the angle 37 between ment above the base plate, a clamp adapted . .
the plate 18 and the platé 14 when the clock” to retain the equatorial plate in any of its
is correctly set gives the latitude of the
- - - - - -- station,
. . .------------ * and
* * this. . may be
- - - "indicated
". .
clock's
by
10 a: *** *graduated
quadrant 38 mounted on the
plate 14.
. ..
.. . . .. A compass card or a circle 39 graduated
in degrees from 0° to 360° may be mounted
or inscribed on the plate 14 so that when the
clock is correctly set the geographical north
and
south line through the clock's position
passes through the graduations 0° and 180°.
The geographical bearing of any location
adjusted positions, a clock dial carried by
the equatorial plate, clock hands for the dial,
a gear train controlling
the hands, and a
aged
sun pointer mounted on a member of the
gear train.
: a base plate,
3. A sun clock comprising
an additional plate pivoted for. angular horiizontal
adjustment with relation to the base
plate, an equatorial plate mounted above the
additional plate for angular adjustment
vertically with relation to said plate, a
clamp adapted to retain the equatorial
plate in any of its adjusted positions, a
80
.
visible
from the clock's station. . may then .be
correctly determined.
The time of sunrise on ahy day of the
clamp adapted to retain the addiyear is determined by passing a straight rod second
tional plate in any of its adjusted positions,
through the pin hole 29 to touch the graph
a clock dial on the equatorial plate, clock
34 at the chosen date mark and bring the hands for the dial, a gear train controlling {}{}
rod to the horizontal with its free end point the hands, and a sun pointer mounted on
ing to the rising sun. By turning the hori
of -the
gear- train. a clock dial,
zontal rod and sun pointer to face the West a– 4.member
:- A- - sun
- - - - - clock
- - - - comprising
the hands of the clock indicate the time of clock hands for the dial, a gear train con
sunset on the date chosen.
"… . . .
-
trolling the hands, a sun pointer mounted
on a member of the gear train, a perfo
rated member on the sun pointer, and a
ing a bay 41 in which a semicircular sup day
chart mounted on the sun pointer for
port 42 for the equatorial plate 18 is ad cooperation
with said perforated member. 100
...,
justably mounted by means of a sliding
"Thºse
piºid (Fig. 5) is circular and
is provided with an upstanding lug 40 hav
5. A sun clock comprising an equatorial
. clock
º #º
adjclock
.
- i.
The support 42 is º
with. . . . . .”pivoting
•
- ?º . .
dial carriedfor.
byº,
said plate,
handsº
plate 43 and set screws 44. . . . . . .
-
means
45 about
which
a circular
band- frame.
centrally of the º and adapted tº
46
forming
the sun
pointer
is adapted
to be mounted
to
traverse
same, a gear train for con
rotated. A pin hole 29 is formed in the trolling the the
operation
said hands, a sun
* frame 46 and a day chart 31 is mounted on pointer mounted on a ofmember
the gear
the frame with its central point diametri train for rotation therewith, a ofperforated
cally
to the
. . in
. two. member carried by the sun pointer, and a
Theopposite
equatorial
platehole
18 is29,rotatable
day chart. mounted on the sun pointer op
45
planes by the rotation of the base plate 10 posite said perforated member for coopera
- the support 42 in the bay 41 so that
and of
there with. . . comprising
. . . an . equatorial
.
. .
the axis 35 of the pivots 45 may be directed tion
6.
A
sun
clock.
to the celestial poles. The principal gear
mounted for vertical angular adjust
wheel of the gear train controlling the hands plate
ment
and
adapted~ to1. ------------------>
be set parallel
to the
is connected with the sun pointer and ro- * - -- - - - Tº 1--- - - ? I
.
.
.
.
.
.
.
.
.
.
.
.
.
celestial
equator,
a
bearing
carried
by
said
tates about the axis 35.
plate with its axis adapted to be directed
Clock hands, not shown, may be mounted
the celestial poles, a sun pointerro
* on the equatorial, plate 18 on a spindle 47 toward
tatable
about
said axis, a clock dial carried
which lies parallel to the axis 35.
il0
115
the plate, clock hands mounted centrally
The face of the semicircular support 42 is by
55” graduated
of
said dial and adapted to traverse the 120
for latitude and an indicator 48 same,
gear wheel secured to the sun.
(Fig. 6) facilitates correct
positioning of pointer,a and
a gear train connecting the
the support 42.
* .
gear wheel with the clock hands.
I claim: . . . . .
comprising a base plate,
1. A sun clock comprising a base plate, 7. A sun clock
60
screws for the plate, an additional 125
means for levelling said plate, an addi. levelling
tional plate pivoted on the base plate on a plate pivoted on the base plate, an equatorial
vertical axis, an equatorial plate mounted plate hinged to the additional plate, a grad
quadrant on the additional plate for . . .
..on and above the additional plate, a clock luated
dial mounted on the equatorial plate, clock cooperation with said equatorial plate, a 130.
hands for the dial, a gear train carried by clock dial carried by the equatorial plate,
-
-
1,680,891
- clock hands for the dial, a gear train con member, said day chart bearing a record
trolling the clock hands, and a rotatable sun of the months of the year, a graph of the
pointer mounted on a member of the gear. equation of time, graduations representing
train.
.
. .
. . selected days of each month and a repre5
8. A sun clock comprising a base plate,
sentation of the projection
of a celestial
levelling screws for the plate, an equatorial meridian.
. . .. . . .. . . . . . . . . . . . . . .
30
'.
plate mounted above the plate for angular 11. A sun clock comprising a base, plate, 35 . . . .
adjustment vertically and horizontally with levelling screws for the plate, an additional
relation to said plate, a clock dial and clock plate pivoted on the base plate for angular
10 hands for the dial carried by the equatorial adjustment in a horizontal plane, a clamp
plate, a gear train controlling the clock for retaining the additional plate in any of . . "
hands, a sun pointer mounted on a member its adjusted positions, an equatorial plate 40
of the gear train, and a graduated compass mounted on the additional plate for angular
.
card mounted above the base plate. . .
adjustment in a vertical plane, a clamp for
9. A sun clock comprising a clock dial, retaining the equatorial plate in any of
clock hands for the dial, a gear train con its adjusted positions, a bearing carried
trolling the movements of the hands, a sun by the equatorial plate with its axis 45
pointer mounted on a member of the gear adapted to be directed to the celestial poles,
train a day chart mounted on the sun. a gear wheel mounted on said axis, a Sun
pointer, there being a graph of the equa pointer
mounted on the gear wheel, a clock
tion of time on the chart. . . . -dial and clock hands for the dial carried by
10. A sun clock comprising a clock dial, the equatorial plate, and a gear train driven 50
clock hands for the dial, a gear train con by said gear wheel and controlling the
trolling the movements of the hands, a sun movements of the clock hands.
... . . . . . .
25 pointer mounted on a member of the gear In testimony whereof I have signed my
train, a perforated member on the sun name to this specification.
pointer, and a day chart carried by the sun
pointer for cooperation with said perforated
wiLLIAM ERNEST COOKE.