Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing and Use Concisely ExplainedVirtue Bros. & Company, 1866 - 185 pages |
From inside the book
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Page
... Tangents 20 8 Secants 10 99 Rhu 1 2 3 44 5 6 7 8 Lon 50 40 30 20 10 Cho 10 20 30 40 50 60 70 80 , 90 S.T. 10 20 30 40 50 60 70 80 90 Про фо Houx Lat II 10 210 30 Tangents S 1/20 180 140 VI III 2 40 50 60 70 BD A TREATISE ON MATHEMATICAL ...
... Tangents 20 8 Secants 10 99 Rhu 1 2 3 44 5 6 7 8 Lon 50 40 30 20 10 Cho 10 20 30 40 50 60 70 80 , 90 S.T. 10 20 30 40 50 60 70 80 90 Про фо Houx Lat II 10 210 30 Tangents S 1/20 180 140 VI III 2 40 50 60 70 BD A TREATISE ON MATHEMATICAL ...
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 ...
Page 17
... Tangents , and Semitangents are principally used for the several projections , or perspective representations , of the circles of the sphere , by means of which maps are constructed . Thus , the meridians and paral- lels of latitude ...
... Tangents , and Semitangents are principally used for the several projections , or perspective representations , of the circles of the sphere , by means of which maps are constructed . Thus , the meridians and paral- lels of latitude ...
Page 18
... tangent plane to the sphere , and the eye is supposed to be at the center of the sphere , the projec- tion is called gnomonic . When the eye is supposed to be at the surface of the sphere , and the primitive to pass through the center ...
... tangent plane to the sphere , and the eye is supposed to be at the center of the sphere , the projec- tion is called gnomonic . When the eye is supposed to be at the surface of the sphere , and the primitive to pass through the center ...
Other editions - View all
Treatise on Mathematical Instruments: Their Construction, Adjustment ... John Fry Heather No preview available - 2016 |
Common terms and phrases
accuracy achromatic adjustment altitude axis azimuth beam compasses bisected breadth bubble called chromatic dispersion clamp coincide colatitude compasses construction correct cross wires described diaphragm distinct vision Ditto ditto divided drawing edge equal error extent will reach eye-piece feet figure fixed focal length given number goniometer graduated half horizontal inches index glass instru instrument intersection IVY LANE latitude lens lenses limb line of collimation line of numbers line of sines logarithmic means measured ment meridian microscope number of degrees object-glass observed paper parallax perpendicular placed plane position primary divisions prism protractor quarter girt radius rays reading reflected image reflector refracting refracting telescopes represent right angles right ascension round secants sector sextant side Slide Rule sliding speculum spherical aberration spirit level square staff station subdivisions tangents telescope theodolite transit transverse distance triangle tube turning vernier scale vertical circle zero
Popular passages
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Page 98 - ... of this field of view. We must therefore place some fixed point in the field, of view, and in the focus of the eye-piece, and the point to which the measurement will have reference will be that point of the object viewed, which...
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