Mathematical Drawing and Measuring Instruments; Their Construction, Uses, Qualities, Selection, Preservation, and Suggestions for Improvements, with Hints Upon Drawing, Colouring, Calculating, Sun Printing, Lettering, &C

Mathematical Drawing and Measuring Instruments; Their Construction, Uses, Qualities, Selection, Preservation, and Suggestions for Improvements, with Hints Upon Drawing, Colouring, Calculating, Sun Printing, Lettering, &C

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...be indicated by the intersection of the crossing lines. Crossing lines taken at separate stations, or upon separate sheets, are conveniently plotted upon the finishing plan by superposition, and pricking through upon a tracing frame or copying table, to be presently described. Paper Fixer.--Several constructions of drawing board have been devised to enable a draughtsman to fix his drawing paper to the surface of a drawing board without cement. The best plan known to the author is that of Mr. J. Stoney, C.E., which is simple, and answers very well. The board is constructed with a taper groove, as shown in section in the illustration above, entirely round the board. Into this groove four lengths of wedgesection slips are fitted, one to each edge. In use, the paper is first damped, then turned down into the grooves, and the wedge slip is inserted upon the paper; this draws it down and holds it tightly. The wedge slip is rendered nearly tight by the pressure of the hand, but a few taps of a mallet will render it perfectly so. To remove the wedge, after the paper is cut off, there are holes through the board, along under the wedge slip, in which a wooden punch can be inserted, and a slight tap will set them free. Papers are most conveniently cut off with a cutting gauge, which makes one cut only along near the edge of the board, see Chap. xxx. Wood Draughtsman's Tray, with Centrolinead (described further on). Draughtsman's Tray.--For drawing upon small wood blocks for the engraver, also upon lithographic stones, the author has constructed a very convenient drawing board in the form of a kind of tray, with a rim an inch thick firmly secured. The rim rises from the inside surface of the bottom of the tray, nearly the thickness of the wood block, which...show more

Product details

  • Paperback | 74 pages
  • 189 x 246 x 4mm | 150g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236578740
  • 9781236578747