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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... , and for Measuring the Angles of Crystals: in which Their Construction, and the Methods of Testing, Adjusting, and Using The John Fry Heather. LIBRARY OF PRINCETON UNIVERSITY 10 20 30 40 50 Semi Tangents Tangents Rhu 11.
... , and for Measuring the Angles of Crystals: in which Their Construction, and the Methods of Testing, Adjusting, and Using The John Fry Heather. LIBRARY OF PRINCETON UNIVERSITY 10 20 30 40 50 Semi Tangents Tangents Rhu 11.
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... , 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 Th John Fry Heather. 5 Plate L. 10 20 30 40 50 60 Semi Tangents.
... , 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 Th John Fry Heather. 5 Plate L. 10 20 30 40 50 60 Semi Tangents.
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... Tangents Tangents Rhu 11 2 31 41 5 6 8 Lon 50 40 30 20 10 Cho 10 20 30 40 60 60 70 80 , 90 Sin 10 20 30 40 50 60 70 20 , 30 40 50 60 Segants 70 Tan 10 20 30 40 50 60 70 S.T Houn 10 20 30 40 50 60 70 80 90 100 ιμα 120 1/30 140 VI 12 IV ...
... Tangents Tangents Rhu 11 2 31 41 5 6 8 Lon 50 40 30 20 10 Cho 10 20 30 40 60 60 70 80 , 90 Sin 10 20 30 40 50 60 70 20 , 30 40 50 60 Segants 70 Tan 10 20 30 40 50 60 70 S.T Houn 10 20 30 40 50 60 70 80 90 100 ιμα 120 1/30 140 VI 12 IV ...
Page 14
... tangents , or tangents of half the angles indicated by the numbers ; and the scale may be continued by continuing the divisions from the quadrant c D , through the quadrant d a , viding , with greatly - improved accuracy , the circles ...
... tangents , or tangents of half the angles indicated by the numbers ; and the scale may be continued by continuing the divisions from the quadrant c D , through the quadrant d a , viding , with greatly - improved accuracy , the circles ...
Page 15
... tangents are equal to the sines of the latitudes . The middle of the hour line being numbered for three o'clock , the divisions for the other hours are found by setting off both ways from the middle the tangents of n . 15 ° , n . being ...
... tangents are equal to the sines of the latitudes . The middle of the hour line being numbered for three o'clock , the divisions for the other hours are found by setting off both ways from the middle the tangents of n . 15 ° , n . being ...
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