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 19
... piece of paper set off P C equal to the major axis , and P B equal to the minor axis : then move the paper into various positions , but so that the point c may always be upon the line w E , and the point B upon the line N s , and the ...
... piece of paper set off P C equal to the major axis , and P B equal to the minor axis : then move the paper into various positions , but so that the point c may always be upon the line w E , and the point B upon the line N s , and the ...
Page 47
... piece of mechanism , which is called a micrometer , and which we pro- ceed to describe , the excess of the angle indicated above 22 ° 40 ′ might be exactly computed . The instrument having been nearly set by the hand alone , the vernier ...
... piece of mechanism , which is called a micrometer , and which we pro- ceed to describe , the excess of the angle indicated above 22 ° 40 ′ might be exactly computed . The instrument having been nearly set by the hand alone , the vernier ...
Page 61
... piece of timber 10 inches broad , 8 inches thick , and 18 feet long . 10 8 Since X 12 12 80 144 ' = set 80 on B against 144 on A , and against 18 on A will be found 10 on B , and the content re- quired is 10 cubic feet . Example 2 ...
... piece of timber 10 inches broad , 8 inches thick , and 18 feet long . 10 8 Since X 12 12 80 144 ' = set 80 on B against 144 on A , and against 18 on A will be found 10 on B , and the content re- quired is 10 cubic feet . Example 2 ...
Page 62
... Piece of Square Timber , which tapers from end to end . - Set the length in feet upon c against 12 upon D , and against half the sum in inches of the quarter girts at the two ends upon D will be found a content in cubic feet upon c ...
... Piece of Square Timber , which tapers from end to end . - Set the length in feet upon c against 12 upon D , and against half the sum in inches of the quarter girts at the two ends upon D will be found a content in cubic feet upon c ...
Page 63
... piece from a round piece of timber will be 36 per cent . , or more than a third of the whole . The timber so taken off must not , however , be considered completely value- less . If the length upon o be set against 12 upon D , instead ...
... piece from a round piece of timber will be 36 per cent . , or more than a third of the whole . The timber so taken off must not , however , be considered completely value- less . If the length upon o be set against 12 upon D , instead ...
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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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