Scientific Instruments > Calculating

Calculating Slide Rule for Measument of Land in Acres

Item#: SCI1309

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Calculating Slide Rule for Measument of Land in Acres - click to enlarge.Calculating Slide Rule for Measument of Land in Acres - click to enlarge.Calculating Slide Rule for Measument of Land in Acres - click to enlarge.Calculating Slide Rule for Measument of Land in Acres - click to enlarge.

W.F Stanley area computing scale for calculating the area in acres of a drawn piece of ground. The plan was covered with a sheet of transparent paper on which
parallel lines are ruled and correspond with the scale of the plan. The wire in the frame was set against the left hand edge on the topmost or lowest drawn line. The numbers of divisions are then counted. The frame then moved to the next parallel line and again the divisions counted, thus throughout the entire drawing. Then all numbers added will give a very close approximation of the complete area measured, in acres.
This set comes with 8 interchangeable boxwood rulers for different scales. Also included is an ivory wedge to help keep the rulers from moving.
The box and main scale are marked Stanley. Box and rulers are all in very good condition. Overall length 58 cm (23 inches)