 | Frederick Walter Simms - 1845 - 184 pages
...clamp screw shewn in the engraving. The sliding indexes, E and F, have each of them a tube adapted to slide on a pin, rising from a heavy circular weight called the fulcrum, which acts as a centre for the whole instrument to turn upon when in use, or to receive a sliding holder... | |
 | John F. Heather - Scientific apparatus and instruments - 1849 - 208 pages
...of the instrument. Several ivory castors support the machine parallel to the paper, and allow it to move freely over it in all directions. The arms, AB and DF, are graduated and marked 5, J, &c., and have each a sliding index, which can be fixed at any of the divisions by a milled-headed... | |
 | Thomas Baker - Railroads - 1850 - 244 pages
...of the instrument. Several ivory castors support the machine parallel to the paper, and allow it to move freely over it in all directions. The arms AB...and have each a sliding index, which can be fixed to any of the divisions by a milled-headed clamping screw, seen in the engraving. The sliding indices... | |
 | Lucius D. Gould - Carpentry - 1853 - 234 pages
...of the instrument. Several ivory castors support the machine parallel to the paper, and allow it to move freely over it in all directions. The arms, AB and DF, are graduated and marked £, J, <fec., and have each a sliding index, which can be fixed at any of the divisions by a milled-headed... | |
 | W.E. WORTHEN - 1857 - 600 pages
...clamp screw shown in the engraving. The sliding indexes, E and E, have each of them a tube adapted to slide on a pin, rising from a heavy circular weight called the fulcrum, which acts as a centre for the whole instrument to turn upon when in use, or to receive a sliding holder... | |
 | William Ezra Worthen - Architectural drawing - 1857 - 650 pages
...clamp screw shown in the engraving. The sliding indexes, E and F, have each of them a tube adapted to slide on a pin, rising from a heavy circular weight called the fulcrum, which acts as a centre for the whole instrument to turn upon when in use, or to receive a sliding holder... | |
 | John Fry Heather - Angles (Geometry) - 1859 - 198 pages
...of the instrument. Several ivory castors support the machine parallel to the paper, and allow it to move freely over it in all directions The arms, AB and DF, are graduated and marked ^, J, £c., and have each a sliding index, which can be fixed at any of the divisions by a milled-headed... | |
 | Thomas Baker (Civil engineer) - 1865 - 278 pages
...of the instrument. Several ivory castors support the machine parallel to the paper, and allow it to move freely over it in all directions. The arms AB...•£, &c., and have each a sliding index which can bo fixed to any of the divisions by a milled-headed clamping screw, seen in the engraving. The sliding... | |
 | John Fry Heather - Mathematical instruments - 1866 - 228 pages
...of the instrument. Several ivory castors support the machine parallel to the paper, and allow it to move freely over it in all directions The arms, AB...on a pin rising from a heavy circular weight called tho fulcrum, or to receive a sliding holder with a pencil or pen, or a blunt tracing point, as may... | |
 | John Fry Heather - Mathematical instruments - 1874 - 220 pages
...to move freely over it in all directions The arms, <IB uuj tF, are graduated and marked 4, J. ^c-> and have each a sliding index, which can be fixed...on a pin rising from a heavy circular weight called tho fulcrum, or to receive a sliding holder with a pencil or pen, fir a blunt tracing point, as may... | |
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... with each other at F, and with the longer rulers at D and E, and, being equal in length to the portions AD and AE of the longer rulers, form with them an accurate parallelogram, ADFE, in every position of the instrument. Several ivory castors support... 
