English Mechanic and Mirror of Science

Vernier caliper with scales in two directions on two sides the caliper meant for measuring the width of a slot is CALIPER RULE the trolls treasure slot Purposes of inside caliper: Inside Calipers are used to measure the diameter of holes, or width of keyways and slots 3 SURFACE PLATE

the wolfs bane slot Used for internal measurement like measuring inside diameter, the width of slots etc The opening can be check by steel rule or micrometre Outside callipers