For those of you familiar with the "Cartographic
Materials" rules for cataloging maps, I have a question
about determining a representative fraction using a bar
scale. I've copied below example #2 from Appendix B
(Guidelines to Determine Scale and Coordinates), B2B
(Conversion from a graphic scale). I don't know if the
formatting will come through or not, so you might have
to check your copy of CM. When I try to replicate the
math, my calculator gives me "63,1578947368" for the
right hand side. Rounding that off would give me a
representative fraction of 1:63,158. Can anyone explain
why CM gives 1:63,157 as the RF? Is there a reason you
would round down?
Also, I'm curious, how likely is it that a map
cataloger would have a ruler that measures to the
accuracy of 1.14 inches anyway?
Thanks in advance for any help you can provide,
Manon Theroux
Head of Technical Services
U.S. Senate LibraryÂ
------------------------------
measure 1.14
inches with a ruler.
1.14
inches (on map) represents 2 000 yards (Earth)
2
000 yards = 2 000 × 36 inches
The
ratio is: 1.14a2
000 × 36)
   or
   or
   1:63
157Â