The practical draughtsman's book of industrial design, and machinist's and engineer's drawing companion; forming a complete course of mechanical, engineering, and architectural drawing (1871)
Armengaud, Charles A., 1813-1893, Armengaud, Charles, 1813-1893, [from old catalog] joint author, Amouroux, Jules, [from old catalog] joint author, Johnson, William, 1823-1864. [from old catalog] · Philadelphia, H. C. Baird · leaf 206
as long as theother, the arc described by its extremity will be twice as great,whatever be the extent of the movement. In this case, howeverthe radii of the arcs would be uniform, and an arrangement is BOOK OP INDUSTRIAL DESIGN. 195 reqnired, providing for tlie >ac<;s>3e i>v );crease in… … tremities and thecentre of motion.It is necessary,however, that the outer joints ofthe lever should be maintained _ constantly parallel to each other, and it is likewise desirable that the instrument should be capa-ble of adjustment for different proportions, otherwise its scopeof usefulness would…
Mechanical drawing
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