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 4
... passes , called bow compasses . with a permanent ink or pencil point , are used . They are formed with a round head , which rolls with ease between the fingers . The adjoining figures represent two varieties of bow pen , fig . 1 being ...
... passes , called bow compasses . with a permanent ink or pencil point , are used . They are formed with a round head , which rolls with ease between the fingers . The adjoining figures represent two varieties of bow pen , fig . 1 being ...
Page 8
... pass between them at other parts , the edges are not true : if , however , the edges appear , as far as the test has now proceeded , to be true , still this may arise from a curvature in one edge fitting into an opposite curvature in ...
... pass between them at other parts , the edges are not true : if , however , the edges appear , as far as the test has now proceeded , to be true , still this may arise from a curvature in one edge fitting into an opposite curvature in ...
Page 10
... passes through the zero point , and the diagonal through the 2 3 6 2 2642o 4 2 31 2 2 4 same point , being nothing on the highest line , and equal to one of the subdivisions on the lowest line , is. 10 MATHEMATICAL INSTRUMENTS .
... passes through the zero point , and the diagonal through the 2 3 6 2 2642o 4 2 31 2 2 4 same point , being nothing on the highest line , and equal to one of the subdivisions on the lowest line , is. 10 MATHEMATICAL INSTRUMENTS .
Page 13
... passes must be extended from one of these points to a short distance beyond the other . Again , by extending the com- passes from the 4th division of the vernier scale to the 31st subdivision , the number 254 would be taken off . To ...
... passes must be extended from one of these points to a short distance beyond the other . Again , by extending the com- passes from the 4th division of the vernier scale to the 31st subdivision , the number 254 would be taken off . To ...
Page 16
... passes from в to c , place one point of the compasses on the beginning , or 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 ...
... passes from в to c , place one point of the compasses on the beginning , or 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 ...
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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