"Planimeter - GPS area measure" is an Android application launched by VisTech.Projects developer for people who need to do measurements on a map using mobile devices. The app uses Google Maps and GPS ...

This metal instrument (possibly of nickel-plated brass) has two pivoted arms with needle points. One is about 9" long, and the other is about 6-1/2" long. The longer arm is used for tracing and is ...

This German silver instrument has a 6-1/2" arm with tracer point and 6-1/2" pole arm. The arm lengths are fixed. The tracer arm and pole arm are connected by a hinge and form a circle around the white ...