John Jacob Holtzapffel · digital reprint by www.CircuitousRoot.com · leaf 103
d the divisions of the micrometer, however, have to be observed and counted to make any series of cuts all of one or of regularly varying lengths, and more than one mechanical method of arresting the traverse has been adopted to avoid this inconvenience, to prevent errors arising from momentary… … and effective that they are the more general. They consist of a pair of metal bars easily placed and removed, clamping and sliding on the tee, and provided each with short adjustment screws with capstan heads, passing through them at about the center of their length. The tool having travelled in…
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-graphophonepaten12unit-440-0.webp)
