Bolster

A perforated wooden block upon which sheet metal is placed to be punched. A sleeve-bearing through which a spindle passes. A bar placed across the middle of a car truck to support the body. In stone sawing, one of the loose wooden blocks against which the ends of the pole of the saw rests. One of the transverse pieces of an arch centering. A timber or thick iron plate placed between the end of a bridge and its seat on the abutment.