Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing and Use Concisely ExplainedVirtue Bros. & Company, 1866 - 185 pages |
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... angles of crystals . The greater part of the Wood Engravings , and some parts of the Text , of " Simms's Mathematical Drawing Instruments , " have been pressed into the service of the present work ; and the works of the best writers ...
... angles of crystals . The greater part of the Wood Engravings , and some parts of the Text , of " Simms's Mathematical Drawing Instruments , " have been pressed into the service of the present work ; and the works of the best writers ...
Page 7
... angles to the plane of the instrument , which may be brought to coincide , in the first instance , with any three points on the original , and then transferred to the copy . After this first step two of these points must be set upon two ...
... angles to the plane of the instrument , which may be brought to coincide , in the first instance , with any three points on the original , and then transferred to the copy . After this first step two of these points must be set upon two ...
Page 14
... angles to each other , which will divide the circle into four quadrants , A B , B C , C D , and D A. Divide the quadrant c D into nine equal parts , each of which will contain ten degrees , and these parts may again be subdivided into ...
... angles to each other , which will divide the circle into four quadrants , A B , B C , C D , and D A. Divide the quadrant c D into nine equal parts , each of which will contain ten degrees , and these parts may again be subdivided into ...
Page 15
... angles , of which the 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 ...
... angles , of which the 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 ...
Page 16
... angle , or to measure an angle already laid down . 1st . To set off an angle , which shall contain ' D ° from the point A , in the straight line Open the compasses to A B. the extent of 60 ° upon the line of chords , which equals the ...
... angle , or to measure an angle already laid down . 1st . To set off an angle , which shall contain ' D ° from the point A , in the straight line Open the compasses to A B. the extent of 60 ° upon the line of chords , which equals the ...
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
Page 5 - To which is added, a description of the Principles and Practice of Isometrical Projection. By JF HEATHER, MA -With 14 Plates.
Page 69 - ... that the sine of the angle of refraction bears a constant ratio to the sine of the angle of incidence...
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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Page 11 - THE ENTIRE SERIES IS FREELY ILLUSTRATED ON WOOD AND STONE WHERE REQUISITE. The Public are respectfully informed that the whole of the late MB.
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Page 24 - From the center at a draw the line ag for the axis of the gnomon agi, and from g let fall the perpendicular gi upon the horizontal meridian line an, and there will be formed a triangle ag i.
Page 143 - ... of them, those which apply to the eye-end of the telescope will answer much better ; the former having their errors magnified by the power of the telescope, will, in proportion to this power, and those errors, be less distinct than the latter. " In taking distances, when the position does not vary from the vertical above thirty or forty degrees, the handles which are attached to the circle are generally most conveniently used ; but in those which incline more to the horizontal, that handle which...
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