This may be followed up by centering the end of a round bar so as to make it true.
German gimlet-bits, Fig. 128, have the advantage of centering well.
Two-thirds of this labor was on the centering or $0.36 per lin.
The centering and the beam and girder forms were supported by 6×6-in.
The lumber of the centering for the vaulting was spruce for the ribs and posts, and 1-in.