A Treatise on Mathematical Instruments: Including Most of the Instruments Employed in Drawing, for Assisting the Vision, in Surveying and Levelling, in Practical Astronomy, and for Measuring the Angles of Crystals: in which Their Construction, and the Methods of Testing, Adjusting, and Using Them, are Concisley ExplainedJ. Weale, 1856 - 170 pages |
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Page
... Theodolite · 112 113 115 117 121 122 Surveying , Remarks on 126 Circular Protractor T Square and Semicircular Protractor Plotting Scale of best Form Computation of the Area of a Plot 129 131 133 135 Station Pointer • 135 PART IV ...
... Theodolite · 112 113 115 117 121 122 Surveying , Remarks on 126 Circular Protractor T Square and Semicircular Protractor Plotting Scale of best Form Computation of the Area of a Plot 129 131 133 135 Station Pointer • 135 PART IV ...
Page 46
... in- dex , the limb of the instrument is graduated , as though it were double the size ; so that the verniers really occupy an arc of 4 ° 55 ′ only . The limbs of small theodolites are generally divided at every 46 MATHEMATICAL INSTRUMENTS .
... in- dex , the limb of the instrument is graduated , as though it were double the size ; so that the verniers really occupy an arc of 4 ° 55 ′ only . The limbs of small theodolites are generally divided at every 46 MATHEMATICAL INSTRUMENTS .
Page 47
... theodolites are generally divided at every 30 minutes , and 29 of these parts are made equal to 30 divisions of their verniers , which therefore enables us to read 30 ' off to an accuracy of or 1 ' . 30 " 5 In the mountain barometer the ...
... theodolites are generally divided at every 30 minutes , and 29 of these parts are made equal to 30 divisions of their verniers , which therefore enables us to read 30 ' off to an accuracy of or 1 ' . 30 " 5 In the mountain barometer the ...
Page 92
... theodolite . And under the third , in addition to the instruments already described in Part I. of this Work , we shall say something of— 1. The large circular protractor . 2 , The T square and semicircular protractor . 3. The best form ...
... theodolite . And under the third , in addition to the instruments already described in Part I. of this Work , we shall say something of— 1. The large circular protractor . 2 , The T square and semicircular protractor . 3. The best form ...
Page 94
... theodolite , or the vertical risings and fallings being taken by the process of levelling with the spirit level and staves , the correct horizontal distances must thence be computed . The following table shows the number of links to be ...
... theodolite , or the vertical risings and fallings being taken by the process of levelling with the spirit level and staves , the correct horizontal distances must thence be computed . The following table shows the number of links to be ...
Other editions - View all
A Treatise On Mathematical Instruments: Including Most of the Instruments ... John Fry Heather No preview available - 2022 |
A Treatise on Mathematical Instruments: Including Most of the Instruments ... John F Heather No preview available - 2016 |
Common terms and phrases
accuracy adjustment altitude axis azimuth beam compasses bisected breadth bubble called chain chromatic dispersion clamp coincide colatitude compasses construction correction cross wires described diaphragm distinct vision Ditto ditto divided drawing edge equal error extent will reach eye-piece feet figure focal length given number goniometer horizontal inches index glass instru instrument intersection latitude lens lenses limb line of chords line of collimation line of numbers line of sines logarithmic marked means measured meridian microscope number of degrees object object-glass observed paper parallax parallel plate pass perpendicular placed plane position primary divisions prism protractor quarter girt radius rays reading reflected image reflector refracting refracting telescopes represent right ascension round secants sector sextant side sixth column slider sliding speculum spherical aberration spirit level square station strument subdivisions tangents telescope theodolite transverse distance triangle tube turning vernier scale vertical circle zero