Sketching methods by unknow

Author:unknow
Language: eng
Format: epub
Tags: Military topography. [from old catalog]
Publisher: Washington, Govt. print. off.
Published: 1917-03-25T05:00:00+00:00

Each full division will then show the length on the Avorking scale that will represent 100 of your strides at the desired scale. The fractional division will represent an odd number of strides and may be erased, as there is no need for it.

As an example, assume that you find the average number of strides to cover a measured 1-mile course is 1,048. Lay off a line 6 inches in length (the scale distance for 1 mile) and divide it into 10.48 equal parts.

Each full division will show the distance on your working scale which is required to represent 100 of your strides at a scale of 6 inches to the mile.

To complete your scale, divide the left one of the 100 stride divisions into 10 equal parts. This part of the scale is called the extension and is made in this way for convenience. Each of the 10 parts in the extension represents 10 of your strides. Mark the dividing line between the extension and the main scale as zero and then each dividing line along the main scale between the other parts with the number of hundreds of strides it measures from the zero mark.

It should be remembered that when this method is used the line to be divided in making a scale corresponding to 6 inches to the mile must be the same proportional part of 6 inches that the course on which the average number of strides was secured is of 1 mile. That is, if the course is 1 mile, lay off 6 inches; if it is three-fourths of a mile, lay off (three-fourths of 6 inches) 4* inches; and if the course is one-half mile, lay off (one-half of 6 inches) 3 inches.

The second method is to ascertain the length in inches or fractions of an inch which will represent 100 of your strides. Having this, lay off the number of divisions of that length desired, mark them and paste them on the ruler. For example: Assume that the average number of strides to 1 mile is 1,048. It is desired to construct a working scale at 6 inches to 1 mile. Divide 6 by 10.48 and the result (0.572 inch) will be the length on your working scale which will represent 100 of your strides at 6 inches to 1 mile.

With a scale of equal parts (one reading inches and tenths of inches will serve), lay off as many divisions 0.572 inch long as you may desire in your scale, and each of them will represent 100 of your strides at 6 inches to the mile. Mark off the extension and the main scale as previously described, trim to suit, and paste on rulex*.

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