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
... accurately with the end of the required distance , by 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 ...
... accurately with the end of the required distance , by 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 ...
Page 4
... plans and solids are on the other face of the instrument . To set the instrument it must first be accurately closed , so that the two legs appear but as one ; the 4 MATHEMATICAL INSTRUMENTS . Wholes and Halves Proportional Compasses.
... plans and solids are on the other face of the instrument . To set the instrument it must first be accurately closed , so that the two legs appear but as one ; the 4 MATHEMATICAL INSTRUMENTS . Wholes and Halves Proportional Compasses.
Page 10
... accurately taken off from them ; but , by means of a diagonal scale , the parts of any distance which are the hundredths of the primary divisions are correctly in- dicated , as will easily be understood from its construction , which we ...
... accurately taken off from them ; but , by means of a diagonal scale , the parts of any distance which are the hundredths of the primary divisions are correctly in- dicated , as will easily be understood from its construction , which we ...
Page 13
... accurately - constructed scale of this kind to within the three- hundredth part of a primary division , unless these divisions be themselves very small . We are not aware that a scale of this kind has been put upon the plain scales sold ...
... accurately - constructed scale of this kind to within the three- hundredth part of a primary division , unless these divisions be themselves very small . We are not aware that a scale of this kind has been put upon the plain scales sold ...
Page 14
... accurately constructed by values computed from tabulated arithmetical values of sines , which computed values are set off from a scale of equal parts ; and the circle is divided most accurately by means of such computed chords . The ...
... accurately constructed by values computed from tabulated arithmetical values of sines , which computed values are set off from a scale of equal parts ; and the circle is divided most accurately by means of such computed chords . The ...
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
Page 5 - To which is added, a description of the Principles and Practice of Isometrical Projection. By JF HEATHER, MA -With 14 Plates.
Page 69 - ... that the sine of the angle of refraction bears a constant ratio to the sine of the angle of incidence...
Page 98 - ... of this field of view. We must therefore place some fixed point in the field, of view, and in the focus of the eye-piece, and the point to which the measurement will have reference will be that point of the object viewed, which...
Page 6 - Gd. 131. READY-RECKONER FOR MILLERS, FARMERS, AND MERCHANTS, showing the Value of any Quantity of Corn, with the Approximate Values of Mill-stones & Mill Work.
Page 11 - THE ENTIRE SERIES IS FREELY ILLUSTRATED ON WOOD AND STONE WHERE REQUISITE. The Public are respectfully informed that the whole of the late MB.
Page 5 - Gd. 55. NAVIGATION ; the Sailor's Sea Book : How to Keep the Log and Work it off, &c. ; Law of Storms, and Explanation of Terms, by J. Greenwood. 2s.
Page 24 - From the center at a draw the line ag for the axis of the gnomon agi, and from g let fall the perpendicular gi upon the horizontal meridian line an, and there will be formed a triangle ag i.
Page 143 - ... of them, those which apply to the eye-end of the telescope will answer much better ; the former having their errors magnified by the power of the telescope, will, in proportion to this power, and those errors, be less distinct than the latter. " In taking distances, when the position does not vary from the vertical above thirty or forty degrees, the handles which are attached to the circle are generally most conveniently used ; but in those which incline more to the horizontal, that handle which...
Page 3 - Denison. 3s. 6d. 78. STEAM AND LOCOMOTION, on the Principle of connecting Science with Practice, by J. Sewell. 2s. 78*.