The heavy weight is pinned onto the map and the tracing arm is used to follow the boundary to be measured. Reading from the digital scale the area in square centimetres 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 precisionPlanimeter used to measure areas from scale maps. Kent Planitron UP103forests commission victoria (fcv), forest measurement, surveying

Incomplete set of standard Troy weights (Pennyweights), used in the valuation and measurement of precious metals. Set consists of 6,5,4,2,1 and 1//2 pennyweights (3 is missing), and 6,5,4, and 2 grains (1 and 3 are missing).pennyweights, weights and measures, troy weights