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 2
... of which the two points fit into the two holes seen in the nut , n , of the joint ; and by turning this nut the joint is made stiffer or easier at pleasure . To take a Distance with the Hair Compasses . - 2 MATHEMATICAL INSTRUMENTS .
... of which the two points fit into the two holes seen in the nut , n , of the joint ; and by turning this nut the joint is made stiffer or easier at pleasure . To take a Distance with the Hair Compasses . - 2 MATHEMATICAL INSTRUMENTS .
Page 13
... seen . To take off , therefore , 253-5 , the com- 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 ...
... seen . To take off , therefore , 253-5 , the com- 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 ...
Page 40
... seen how to find the degrees ( or measure ) .of an angle already laid down . E LINE OF POLYGONS . A B F The line of polygons is chiefly useful for the ready division of the circumference of a circle into any number of equal parts from 4 ...
... seen how to find the degrees ( or measure ) .of an angle already laid down . E LINE OF POLYGONS . A B F The line of polygons is chiefly useful for the ready division of the circumference of a circle into any number of equal parts from 4 ...
Page 47
... seen in fig . 1 , being at the back of the instrument . The instrument is then set more accurately by the screw at the side of the vernier , shown in both figures , which gives a slow motion to the vernier plate , and to the limb or ...
... seen in fig . 1 , being at the back of the instrument . The instrument is then set more accurately by the screw at the side of the vernier , shown in both figures , which gives a slow motion to the vernier plate , and to the limb or ...
Page 51
... seen in the engraving . The sliding indices have each of them a tube , adapted either to slide on a pin rising from a heavy circular weight called the fulcrum , or to receive a sliding holder with a pencil or pen , or a blunt tracing ...
... seen in the engraving . The sliding indices have each of them a tube , adapted either to slide on a pin rising from a heavy circular weight called the fulcrum , or to receive a sliding holder with a pencil or pen , or a blunt tracing ...
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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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