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How to calculate scale bar length on a line drawing from

How to calculate scale bar length on a line drawing from a photo taken on a compound microscope.
Please review carefully the document β€œHow to determine the actual length of a specimen or structure on the compound microscope?”
(Determine actual size of specimenCpdScope2017.pdf).
From this you will have the actual length of a specimen or a structure. Let’s say the structure is the width of the coenosarc within the hydrocaulus of
the Obelia hydroid colony and its actual width is 0.52 mm.
As instructed, you print the photo as a half page in size using the Print Pictures utility in Windows Explorer and the measured width of the coenosarc
on the printed photo is 5.2 mm.
If you would like a scale bar on the printed photo that represents 0.5 mm, how long would the scale bar on the printed photo have to be drawn?
Here is the calculation:
π‘Žπ‘π‘‘π‘’π‘Žπ‘™ π‘™π‘’π‘›π‘”π‘‘β„Ž π‘Ÿπ‘’π‘π‘Ÿπ‘’π‘ π‘’π‘›π‘‘π‘’π‘‘ 𝑏𝑦 π‘‘β„Žπ‘’ π‘ π‘π‘Žπ‘™π‘’ π‘π‘Žπ‘Ÿ π‘œπ‘› π‘π‘Ÿπ‘–π‘›π‘‘π‘’π‘‘ π‘β„Žπ‘œπ‘‘π‘œ
π‘’π‘›π‘˜π‘›π‘œπ‘€π‘› π‘‘π‘Ÿπ‘Žπ‘€π‘› π‘™π‘’π‘›π‘”π‘‘β„Ž π‘œπ‘“ π‘ π‘π‘Žπ‘™π‘’ π‘π‘Žπ‘Ÿ π‘œπ‘› π‘π‘Ÿπ‘–π‘›π‘‘π‘’π‘‘ π‘β„Žπ‘œπ‘‘π‘œ
=
π‘Žπ‘π‘‘π‘’π‘Žπ‘™ π‘€π‘–π‘‘π‘‘β„Ž π‘œπ‘“ π‘π‘œπ‘’π‘›π‘œπ‘ π‘Žπ‘Ÿπ‘ π‘œπ‘› π‘π‘œπ‘šπ‘π‘œπ‘’π‘›π‘‘ π‘šπ‘–π‘π‘Ÿπ‘œπ‘ π‘π‘œπ‘π‘’
π‘šπ‘’π‘Žπ‘ π‘’π‘Ÿπ‘’π‘‘ π‘€π‘–π‘‘π‘‘β„Ž π‘œπ‘“ π‘π‘œπ‘’π‘›π‘œπ‘ π‘Žπ‘Ÿπ‘ π‘œπ‘› π‘π‘Ÿπ‘–π‘›π‘‘π‘’π‘‘ π‘β„Žπ‘œπ‘‘π‘œ
0.5 π‘šπ‘š
𝑋
=
0.52 π‘šπ‘š 5.2 π‘šπ‘š
𝑋=
0.5 𝑋 5.2
0.52
𝑋 = 5 π‘šπ‘š
Therefore, the length of the scale bar that you need to draw on the printed photo is 5 mm. This scale bar should also be traced onto your tracing
paper.
Scale bar for a line drawing_cpdscope2017

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