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 10
... zero point above . Then , since these diagonal lines are all parallel , and consequently everywhere equidistant , the distance between any two of them in suc- cession , measured upon any of the eleven parallel lines which they intersect ...
... zero point above . Then , since these diagonal lines are all parallel , and consequently everywhere equidistant , the distance between any two of them in suc- cession , measured upon any of the eleven parallel lines which they intersect ...
Page 11
... zero point by one - tenth of the ex- tent of a subdivision , or one - hundredth of the extent of a pri- mary division . Our figure represents the two diagonal scales which are usually placed upon the plane scale of six inches in length ...
... zero point by one - tenth of the ex- tent of a subdivision , or one - hundredth of the extent of a pri- mary division . Our figure represents the two diagonal scales which are usually placed upon the plane scale of six inches in length ...
Page 12
... zero point * . The first thus increased with the second now represents 35 of the subdivisions from the zero point , from which the third figure , 3 , must be subtracted , leaving 32 ; since three divisions of the vernier scale will ...
... zero point * . The first thus increased with the second now represents 35 of the subdivisions from the zero point , from which the third figure , 3 , must be subtracted , leaving 32 ; since three divisions of the vernier scale will ...
Page 16
... zero point , of the line of chords , and the other point will extend to the number upon this line , indicating the degrees in the angle B A C. If , for instance , this point fall on the 41st division , or the first division beyond that ...
... zero point , of the line of chords , and the other point will extend to the number upon this line , indicating the degrees in the angle B A C. If , for instance , this point fall on the 41st division , or the first division beyond that ...
Page 27
... zero point upon our scale , and consequently angles smaller than this cannot be taken off from the sines . This remark applies equally to the line of tangents , the tabulated logarithmic tangent of 34 ' 23 " being 8.0000886 . By taking ...
... zero point upon our scale , and consequently angles smaller than this cannot be taken off from the sines . This remark applies equally to the line of tangents , the tabulated logarithmic tangent of 34 ' 23 " being 8.0000886 . By taking ...
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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
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