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 20
... determined upon describe a circle for the primitive , and draw its vertical and horizontal diameters , N s and w E , which will be the projections of the meridian of the place and of the prime vertical respectively . From the center c ...
... determined upon describe a circle for the primitive , and draw its vertical and horizontal diameters , N s and w E , which will be the projections of the meridian of the place and of the prime vertical respectively . From the center c ...
Page 22
... determined for the map . upon 2. From one of these divisions , a , which is conveniently situated to form the center of the map , set off from A to c the cotangent of the middle latitude , reduced to a radius equal to 57.3 of the ...
... determined for the map . upon 2. From one of these divisions , a , which is conveniently situated to form the center of the map , set off from A to c the cotangent of the middle latitude , reduced to a radius equal to 57.3 of the ...
Page 54
... determined by the use of the proportional compasses , described at page 4 , place the same point in the copy . From ... determine the place of the Vernier to arched limb . 101 3 22 8 9. 54 MATHEMATICAL INSTRUMENTS.
... determined by the use of the proportional compasses , described at page 4 , place the same point in the copy . From ... determine the place of the Vernier to arched limb . 101 3 22 8 9. 54 MATHEMATICAL INSTRUMENTS.
Page 55
... determined in the smaller squares of the original , and transferred to the larger squares of the copy . The process of enlarging , under any circumstances , does not , however , admit of the same ac- curacy as that of reducing . Having ...
... determined in the smaller squares of the original , and transferred to the larger squares of the copy . The process of enlarging , under any circumstances , does not , however , admit of the same ac- curacy as that of reducing . Having ...
Page 66
... determined on one straight line by the intersection of another . " 3. Whenever the compasses can be used in any part of a construction , or to construct the whole problem , they are to be preferred to the rule , unless the process is ...
... determined on one straight line by the intersection of another . " 3. Whenever the compasses can be used in any part of a construction , or to construct the whole problem , they are to be preferred to the rule , unless the process is ...
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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
Popular passages
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