The principles of pattern making, written specially for apprentices and students in technical schools (1900)
Horner, Joseph Gregory, 1847-1927 · London, New York, Pitman · leaf 104
and theupper half of the block is removed. This division istherefore made, except in the case of shallow wheelsof coarse pitch where the interference is but slight. There is another thing. Many machines are onlyproperly constructed to lift their tooth blocks verti-cally, a mode of withdrawal which… … SECTION. Fig. 70. Core Box for Bevel Whee], 90 PRINCIPLES OF PATTERN MAKING. be as one, the carrier block can be lifted vertically,leaving the teeth behind, to be withdrawn in thehorizontal direction. Being made in this way, thedivision along the line a-a gives no extra trouble, butis really…
Patternmaking
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-455-319.webp)
