A Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing, and Use Concisely Explained |
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Page 2
... turning the screw backwards , the steel point may be gradu- ally allowed to be pulled backwards by the spring , and may again be gradu- ally pulled forwards by the screw being turned forwards . Fig . 1 represents when these compasses ...
... turning the screw backwards , the steel point may be gradu- ally allowed to be pulled backwards by the spring , and may again be gradu- ally pulled forwards by the screw being turned forwards . Fig . 1 represents when these compasses ...
Page 3
... turning the screw . COMPASSES WITH MOVEABLE POINTS . If an arc or circle is to be described faintly , merely as a guide for the terminating points of other lines , the steel points are generally sufficient for the purpose , and are ...
... turning the screw . COMPASSES WITH MOVEABLE POINTS . If an arc or circle is to be described faintly , merely as a guide for the terminating points of other lines , the steel points are generally sufficient for the purpose , and are ...
Page 47
... turning a screw , called the clamping screw , which is shown on the top of the vernier in fig . 2 , but is not seen in fig . 1 , being at the back of the instrument . The instrument is then set more accurately by the screw at the side ...
... turning a screw , called the clamping screw , which is shown on the top of the vernier in fig . 2 , but is not seen in fig . 1 , being at the back of the instrument . The instrument is then set more accurately by the screw at the side ...
Page 50
... turning the screw F till the points do exactly measure that quantity on the detached scale ; then , by loosening the little screws which hold the vernier b in its place , the position of the vernier may be gradually changed , till its ...
... turning the screw F till the points do exactly measure that quantity on the detached scale ; then , by loosening the little screws which hold the vernier b in its place , the position of the vernier may be gradually changed , till its ...
Page 78
... turning apparatus , and the grind- ing and polishing performed entirely by the aid of mechanical contrivances , so that the proper parabolic form is accurately given to it . To test the work , the dial - plate of a watch is placed upon ...
... turning apparatus , and the grind- ing and polishing performed entirely by the aid of mechanical contrivances , so that the proper parabolic form is accurately given to it . To test the work , the dial - plate of a watch is placed upon ...
Common terms and phrases
accuracy achromatic adjustment altitude axis azimuth beam compasses bisected breadth bubble called chain chromatic dispersion clamp cloth boards coincide compasses construction correct cross wires described distinct vision divided drawing edge Edition ENGINEERING equal error extent will reach eye-piece feet figure fixed focal length given number graduated half HENRY LAW horizontal Illustrated inches instru instrument intersection latitude lens lenses limb line of collimation line of numbers line of sines logarithmic means measured ment meridian microscope object object-glass observed paper parallax pass perpendicular placed plane position primary divisions prism protractor quarter girt radius RALPH TATE rays reading reflector refracting refracting telescopes represent right angles right ascension round screw secants sextant side slider sliding speculum spherical aberration spirit level square station subdivisions survey tangents telescope theodolite tion transverse distance triangle tube turning vernier scale vertical circle Woodcuts zero
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