Special purpose slide rule (nomogram) for 155mm howitzer guns (3 pieces)
Catalog Number
102627818
Type
Physical object
Description
Three slide rules (more properly called nomograms because, although they have a cursor, they don't actually have a sliding scale) used for aiming howitzer guns. Scales on both sides of each of the three devices for different charges (charges 1,3,4,5,6,7).