to 8 ft.

The separate parts are the steel bar A, the cast-iron frame B, the tip C into which fits the screw D, on the other end of which is the crank E, and the slide F with its dog G, which engages in the notches on the bar.

Any part, if broken, can be replaced separately.
[Illustration: Fig.174.Adjusting Handscrew.] _Iron Handscrews_, also called C clamps and carriage-makers' clamps.
Fig.

177, are useful in certain kinds of work, as in gluing in special places and in wood-carving.

All iron clamps need blocks of soft wood to be placed between them and the finished work.
_Pinch-dogs_, Fig.