 | John F. Heather - 1849 - 208 σελίδες
...line (from whence other and angular lines are to be drawn), and the center of the instrument coincide with the given angular point on such line. This done,...setting of the instrument, a great number of angles, or a complSte circular protractor, may be laid off from the same point. THE T SQUARE AND SEMICIRCULAR... | |
 | John Fry Heather - 1849 - 202 σελίδες
...point on such line. This done, press the protractor gently down, which will fix it in position t>y means of very fine points on the under side. It is...setting of the instrument, a great number of angles, or a complete circular protractor, may be laid off from the same point. THE T SQUARE AND SEMICIRCULAR... | |
 | Thomas Baker - 1850 - 244 σελίδες
...vernier reads the required angle. Then press the branches ee gently down, and they will cause their points to make punctures in the paper, at opposite...In this manner, at one setting of the instrument, any proposed number of angles may be laid off from the same point. PLANNING EXTENSIVE SURVEYS, IMPROVED... | |
 | Sir Henry Edward Landor Thuillier - 1851 - 826 σελίδες
...pinion d till the opposite vernier reads the required angle. Then press downwards the branches e, e which will cause the points to make punctures in the...setting of the instrument, a great number of angles, or a complete circular protractor, may be laid off from the same point. TIIE CIRCULAR " TALC" PROTRACTOR.... | |
 | William Ezra Worthen - 1857 - 650 σελίδες
...the instrument, as denoted by the before-mentioned intersection of the cross lines upon the glass. In using this instrument, the vernier should first...number of angles may be laid off from the same point. It is not essential that the centre be over the given point, when applied to the given line, provided... | |
 | William Ezra Worthen - 1857 - 632 σελίδες
...vernier should first be set to zero (or the division marked 360) on the divided limb, and then Fig. 7«. placed on the paper, so that the two fine steel points...instrument was first correctly set. In this manner, at one Betting of the instrument, a great number of angles may be laid off from the same point. It is not... | |
 | W.E. WORTHEN - 1857 - 600 σελίδες
...vernier should first be set to zero (or the division marked 360) on the divided limb, and then Fig. 76. given angle, or any number of angles that may be required,...number of angles may be laid off from the same point. It is not essential that the centre be over the given point, when applied to the given line, provided... | |
 | John Fry Heather - 1859 - 198 σελίδες
...line (from whence other and angular lines are to be drawn), and the center of the instrument coincide with the given angular point on such line. This done,...setting of the instrument, a great number of angles, or a complete circular protractor, may be laid off from the same point. THE T SQUARE AND SEMICIRCULAR... | |
 | Samuel H. Brooks - 1860 - 262 σελίδες
...angle. Then press down the branches, which will cause the points to make punctures in the paper on opposite sides of the circle; which being afterwards...the instrument a great number of angles may be laid from the same point. As described for the last instrument, it is not essential that the centre be over... | |
 | William Johnson - 1860 - 442 σελίδες
...will cause the points to make punctures in the papcr at opposites sides of the circle. These points being afterwards connected, the line will pass through the given angular point, if the instrument was correctly adjusted at the outset. In this way at one setting of the instrument a great number of angles... | |
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This done, press the protractor gently down, which will fix it in position by means of very fine points on the under side. It is now ready to lay off the given angle, or any number of angles that may be required, which is done by turning the pinion d... 
