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 176
dge of a ruler, whilst the wire carrying the pen is left tofind its way from its initialangular position, to that ofa line in the same plane asthe slider; and, in doingthis, the pen describes thecurve we have represented.Fig. 3 is a vertical sectionof a millstone arrangementon this system,… … also shows the adaptation of the principle to footsteps, togetherwith a new system of lubrication of these surfaces so liable toextreme abrasion. Tho oil supply is kept in an elevated vessel, a,whence a pipe, b, proceeds downwards to the footsteps, uponwhich a pressure is thus constantly kept by…
