The practical metal-worker's assistant : containing the arts of working all metals and alloys, forging of iron and steel, hardening and tempering, melting and mixing, casting and founding, works in sheet metal, the processes dependent on the ductility of the metals, soldering, and the most improved processes, and tools employed by metal-workers, with the application of the art of electro-metallurgy to manufacturing processes : collected from original sources, and from the works of Holtzapffel, Bergeron, Leupold, Plumier, Napier, and others ... (1851)
Byrne, Oliver · Philadelphia : H.C. Baird · leaf 365
plex apparatus in originatingthe screw of his dividing engine for straight lines, which it wasessential should contain exactly 20 threads in the inch ; a conditionuncalled for in the circular engine, in which the equality of the teethof the wheel required the principal degree of attention. This… … The guide-screw G is turned round by the winch, and in eachrevolution moves the larger tangent wheel one tooth; the tangentwheel has a small central boss or pulley p, to which is attached theone end of an elastic slip of steel, like a watch-spring ; the other endof the slip is connected with the…
Metal-work · Electrometallurgy · Metallurgy
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Original microscopic drawings made between the years 1824 and 1840 mostly published in works by Dr. Goring & A. Pritchard [graphic]. (1824)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b21301177-83-1.webp)
