The practical draughtsman's book of industrial design and machinist's and engineer's companion : forming a complete course of mechanical, engineering and architectural drawing (1866)
Armengaud, M. (Jacques Eugène), 1810-1891, Armengaud, M. (Charles), 1813-1893, Amouroux, M. (Jules), Johnson, William, 1823-1846 · Philadelphia : H.C. Baird · leaf 200
the side ; butto prevent the point of the screw from injuring thebar, a loose plate of metal is interposed next to thebar, as shown in the section, fig. 24. The socket,m, is in a solid piece with its pen, or pencil-holder ; but the centre leg, n, is in a separatepiece from its socket, m, and is… … horizontal screw passage, or nut, to receive the screw spindle,i, which is held by an eye at the end of the socket groove,and is actuated by means of a button on the outside. By 100 THE PRACTICAL DRAUGHTSMANS turning the screw, i, in either direction, the centre leg may boadjusted with great…
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-515-346.webp)
