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 3
... fixed leg on the point from which the distance is to be taken , and make the extremity of the other leg coincide accurately with the end of the required distance , by turning the screw . COMPASSES WITH MOVEABLE POINTS . If an arc or ...
... fixed leg on the point from which the distance is to be taken , and make the extremity of the other leg coincide accurately with the end of the required distance , by turning the screw . COMPASSES WITH MOVEABLE POINTS . If an arc or ...
Page 7
... fixed to a handle ; and they are so bent , that a suffi- cient cavity is left between them for the ink , when the ends of the steel points meet close to- gether , or nearly so .. The blades are set with the points more or less open by ...
... fixed to a handle ; and they are so bent , that a suffi- cient cavity is left between them for the ink , when the ends of the steel points meet close to- gether , or nearly so .. The blades are set with the points more or less open by ...
Page 24
... b , its hypothenuse or axis a g will be parallel to the axis of the earth when the dial is fixed truly , and will cast its shadow on the hour of the day . To make an erect South Dial . - Take the 24 MATHEMATICAL INSTRUMENTS .
... b , its hypothenuse or axis a g will be parallel to the axis of the earth when the dial is fixed truly , and will cast its shadow on the hour of the day . To make an erect South Dial . - Take the 24 MATHEMATICAL INSTRUMENTS .
Page 25
... . They may be constructed as follows : - : - 1. To construct the Line of Logarithmic Numbers marked N - Having fixed upon a convenient length for the entire CONSTRUCTION OF LOGARITHMIC , OR GUNTER'S LINES . 25 Gunter's Lines.
... . They may be constructed as follows : - : - 1. To construct the Line of Logarithmic Numbers marked N - Having fixed upon a convenient length for the entire CONSTRUCTION OF LOGARITHMIC , OR GUNTER'S LINES . 25 Gunter's Lines.
Page 26
... fixed upon a convenient length for the entire scale , which must be exactly equal to the length of twenty of the primary divisions of the diagonal or vernier scale , or of the beam compasses ( p . 48 ) , by which it is to be divided ...
... fixed upon a convenient length for the entire scale , which must be exactly equal to the length of twenty of the primary divisions of the diagonal or vernier scale , or of the beam compasses ( p . 48 ) , by which it is to be divided ...
Other editions - View all
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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