Historical information

The heavy weight is pinned onto the map and the tracing arm is used to follow the boundary to be measured
Reading the number of revolutions from the two the scale wheels the area in square inches could be measured.
Knowing the scale of the mapsheet the figure was converted to areas or hectares
Generally at least three measurements were taken to ensure accuracy and precision

Physical description

Planimeter used to measure areas from scale maps.
Includes wooden box
One revolution of the main wheel equaled 10 square inches.
A smaller rotating scale on the side was used to subdivide the area.

Inscriptions & markings

Benalla