ClipArt ETC
"Measurement of distance on a map by means of an engineer's scale." -U.S. Chief of Engineers

Engineer's Scale

"Measurement of distance on a map by means of an engineer's scale." -U.S. Chief of Engineers

"The map measurer is an instrument specially designed for quickly measuring distances or lines on a map. It consists of a dial case, handle, and a small wheel or roller." -U.S. Chief of Engineers

Map Measurer

"The map measurer is an instrument specially designed for quickly measuring distances or lines on a…