John Jacob Holtzapffel · digital reprint by www.CircuitousRoot.com · leaf 116
y with the tangent-screw and its driving pulley. In dth -^ / addition a right-angled lever is fixed beneath the mainslide with its shorter arm passing through a straight horizontal mortise in the before-mentioned plate into a long curved slot counter- sunk in the back of the tangent-screw carriage,… … with the wormwheel, and towards the driving pulley as instantly disengages it and retains it out of action. The apparatus being only designed for the lighter finishing cuts the pulley is driven with a slack band, which thus without removal allows the tangent-screw to remain in or out of gear. The…
Ornamental turning
Internet Archive · Dr. David M. MacMillan · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten06unit-944-0.webp)
