W.H. Harling Plotting Rule With Pouch

Plotting Rule, W.H. Harling, single-sided, wood with brass sighting pieces at each end. In leather pouch, wood / metal / leather, WH Harling, London, 1919. The end pieces that lift to 90 degrees and act as sighting elements are bolted by four bolts each. Map reading scales are marked on each bevelled edge of the rule.

For military (gun laying) or survey use. Used with a plotting table. The rule is laid on the plotting table upon which an ordnance survey map has been placed; a landmark is sighted using the visual cursor provided by the two end pieces so that the bearing of the landmark can then be accurately plotted onto the map.

Plotting Rule : W.H. Harling, London, 1919, No. 8125.

Leather Pouch : JAS DAWSON & SONL 1918