John Jacob Holtzapffel · digital reprint by www.CircuitousRoot.com · leaf 221
mutually reduced taper and meet in a point at the apex. For the tetrahedron or pyramid of three sides, indi- vidually equal to the base, fig. 209, the sliderest stands at an angle of 191 degrees * to the cylinder, and the equal sides and base thus arise so soon as the traverses of the tool produce… … rechucked in the manner described for fig. 207, that the projec- tion left by its separation from the cylinder may be turned level with the base. This last operation may be avoided by first carefully surfacing one face of a short length of material, glueing that to the true surface of another piece…
Ornamental turning
Internet Archive · Dr. David M. MacMillan · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Medical zoology and mineralogy. Or, Illustrations and descriptions of the animals and minerals employed in medicine, and of the preparations derived from them; including also an account of animal and mineral poisons, with figures coloured from nature / [John Stephenson]. (1832)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b22010932-355-1.webp)
