Helical teeth, cutting in the lathe, [i, 69].
Herring-bone gear-teeth, [i, 69].
Hexagon gauge, [i, 381].
Hide, parts of, used for belting, [ii, 208].
High pressure steam engine, [ii, 372].
High speed automatic engines, [ii, 427].
Hobbing dies, methods of, [i, 473].
Hob for threading dies, [i, 474].
Hobs and their uses, [i, 335].
for cutting up dies, [i, 99].
threading dies, [i, 474].
Hoe, [ii, 369].