Identifier: practicaldraug00arme (find matches)
Title: 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
Year: 1866 (1860s)
Authors: Armengaud, M. (Jacques Eugène), 1810-1891 Armengaud, M. (Charles), 1813-1893 Amouroux, M. (Jules) Johnson, William, 1823-1846
Subjects: Mechanical drawing Architectural drawing Industrial design
Publisher: Philadelphia : H.C. Baird
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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Text Appearing Before Image:
ed vertically intothe paper. A lengthening bar is also provided, which can be fittedinto the shank-socket, whilst the pen or pencil can be placed atthe end of the bar, thus giving the compasses a greater range. In fins. 10 and 11, we have represented a modification of thisinstrument, of German invention. This tool has no separatepieces, but is so arranged, that a pen, pencil, or point, may bebrought into action as desired. The shanks are forked, and theleo- pieces are jointed to their extremities. One of the leg piecesis formed with a steel point at one end, and a pen at the other;whilst the other leg has a steel point at one end, and a lead pencilat the other. The legs are jointed to the shanks by their longi-tudinal centres, and can be turned between the forks, so as tobring into action whichever end of the leg is required. A smallpinching-screw is passed through one side of the shank, near itsextremity, to fix the leg in position. J 88 THE PRACTICAL DRAUGIITSxMANS Pig, 10. Fig. 11.
Text Appearing After Image:
Fig- Fig. 12 is the repre-sentation of a some-what smaller pair ofcompasses, in whichthe pen is formed inone piece with a steelpoint, which may beinverted, or a pencil-holder introduced in-stead. This is a con-venient instrument forsmall work. Another form ofcompass is representedin tigs. 13, 14, 15, and16. This is a pock-et, or turn-in com-pass, and takes up avery small spaco whenclosed, as in fig. 13.Fig. 14 is a cross sec-tion, taken at the line1—2, in fig. 13. Figs.15 and 16 are front andside views of the in-strument when fullyopen. These com-passes are of Frenchconstruction, and insome points not unlikethe German pair justdescribed. The shanksare each jointed, and their lower portionsare forked to receive the swivelling points,which are jointed to them at their extremi-ties. The swivelling points are formedrespectively with a pen and pencil at theiropposite extremities, and any one of thesemay be turned round into working positionwhen required. A lateral screw for fixingthe poi

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