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 9
... feet , & c .; if the subdivisions are taken as tens , the primary divisions will be hundreds ; and , if the primary divisions be units , the subdivisions will be tenths . Co 1 2 3 4 5 6 7 89 10 1 2 3 4 5 6 789 50 TTT 1 2 3 4 51 6 7 8 9 ...
... feet , & c .; if the subdivisions are taken as tens , the primary divisions will be hundreds ; and , if the primary divisions be units , the subdivisions will be tenths . Co 1 2 3 4 5 6 7 89 10 1 2 3 4 5 6 789 50 TTT 1 2 3 4 51 6 7 8 9 ...
Page 10
... feet and inches , 6 feet 7 inches for instance , extend the compasses from the primary division numbered 6 , to the 7th upper subdivision , reckoning back- wards , as before . Diagonal Scales . - In the simply - divided scales one of ...
... feet and inches , 6 feet 7 inches for instance , extend the compasses from the primary division numbered 6 , to the 7th upper subdivision , reckoning back- wards , as before . Diagonal Scales . - In the simply - divided scales one of ...
Page 29
... feet long by 15 inches broad Extend from 1 to 1.25 , for 15 inches equals 1.25 feet , and this extent will reach from 27 feet to 33.75 feet , the super- ficial content required Second Method . - Extend from 12 to the number of inches in ...
... feet long by 15 inches broad Extend from 1 to 1.25 , for 15 inches equals 1.25 feet , and this extent will reach from 27 feet to 33.75 feet , the super- ficial content required Second Method . - Extend from 12 to the number of inches in ...
Page 30
... feet long by 9 inches broad to be 20-25 or 20 feet . To measure a Solid Content . - The breadth , depth , and length being all reduced to the same denomination , extend from 1 to either the breadth or depth , and this extent will reach ...
... feet long by 9 inches broad to be 20-25 or 20 feet . To measure a Solid Content . - The breadth , depth , and length being all reduced to the same denomination , extend from 1 to either the breadth or depth , and this extent will reach ...
Page 38
... Feet and Inches in such a manner that an extent of Three Inches shall represent Twenty Inches.- 1. Make three inches a transverse distance between 10 and 10 , and the transverse distance of 8 and 8 will represent 16 inches . 2. Set off ...
... Feet and Inches in such a manner that an extent of Three Inches shall represent Twenty Inches.- 1. Make three inches a transverse distance between 10 and 10 , and the transverse distance of 8 and 8 will represent 16 inches . 2. Set off ...
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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