Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing and Use Concisely ExplainedVirtue Bros. & Company, 1866 - 185 pages |
From inside the book
Results 6-10 of 48
Page 15
... divided into six equal parts . From the center o , draw straight lines through these divisions to meet the line touching the circle at B , and we shall have the line of hours . From the point D , draw right lines through the divisions ...
... divided into six equal parts . From the center o , draw straight lines through these divisions to meet the line touching the circle at B , and we shall have the line of hours . From the point D , draw right lines through the divisions ...
Page 26
... divided , bisect it , and figure it 1 at the commencement on the left hand , 1 again in the middle , and 10 at the end . The half line , then , is taken for unity , or the logarithm of 10 , and , consequently , the whole line represents ...
... divided , bisect it , and figure it 1 at the commencement on the left hand , 1 again in the middle , and 10 at the end . The half line , then , is taken for unity , or the logarithm of 10 , and , consequently , the whole line represents ...
Page 28
... divided , and that but into five parts instead of ten , every one of which must be accounted as two - tenths . By this line the multiplication and division of numbers of any denomination . either whole or fractional may be readily ...
... divided , and that but into five parts instead of ten , every one of which must be accounted as two - tenths . By this line the multiplication and division of numbers of any denomination . either whole or fractional may be readily ...
Page 29
... divided by 250 , extend the com- passes from 1 on the left to 2.5 , and this extent will reach backwards from 3.125 to 1.25 . Then , since the divisor con- tained 2 powers of ten and the dividend 4 , the quotient must contain 2 , and ...
... divided by 250 , extend the com- passes from 1 on the left to 2.5 , and this extent will reach backwards from 3.125 to 1.25 . Then , since the divisor con- tained 2 powers of ten and the dividend 4 , the quotient must contain 2 , and ...
Page 34
... divided either equally or unequally into any number of parts that may be desired ; the angular functions , viz ... divided into ten equal parts ; and ( 3 ) a foot divided into ten equal primary divisions , each of which is subdivided ...
... divided either equally or unequally into any number of parts that may be desired ; the angular functions , viz ... divided into ten equal parts ; and ( 3 ) a foot divided into ten equal primary divisions , each of which is subdivided ...
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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