Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing and Use Concisely ExplainedVirtue Bros. & Company, 1866 - 185 pages |
From inside the book
Results 1-5 of 27
Page 6
... taking the square root of the product in the manner explained above . The numbers of the scale of solids are the cubes of the ratios of the lengths of the opposite ends of the compasses , when the line across the slider is set to those ...
... taking the square root of the product in the manner explained above . The numbers of the scale of solids are the cubes of the ratios of the lengths of the opposite ends of the compasses , when the line across the slider is set to those ...
Page 7
... taking out the screw the blades may be completely opened , and the points effectively cleaned after use . The ink is to be put between the blades by a common pen , and in using the pen it should be slightly inclined in the direction of ...
... taking out the screw the blades may be completely opened , and the points effectively cleaned after use . The ink is to be put between the blades by a common pen , and in using the pen it should be slightly inclined in the direction of ...
Page 16
... taking the extent of D from the same line of chords , set it off from в to c ; and , join- ing a C , B A C is the angle required . Thus to set off an angle of 41 ° , having described the arc в C , as directed , with one foot of the ...
... taking the extent of D from the same line of chords , set it off from в to c ; and , join- ing a C , B A C is the angle required . Thus to set off an angle of 41 ° , having described the arc в C , as directed , with one foot of the ...
Page 18
... , the sines taken off by the other pair of points . The manner of taking from the sector a sine to any radius will be hereafter pointed out . as a common major axis , describe semi - ellipses 18 MATHEMATICAL INSTRUMENTS .
... , the sines taken off by the other pair of points . The manner of taking from the sector a sine to any radius will be hereafter pointed out . as a common major axis , describe semi - ellipses 18 MATHEMATICAL INSTRUMENTS .
Page 24
... taking the whole of six hours between the parts of the compasses from the scale , with this extent set one foot in the point e , and with the other intersect the meridian line c d at d . Do the same from f to b , and draw the right ...
... taking the whole of six hours between the parts of the compasses from the scale , with this extent set one foot in the point e , and with the other intersect the meridian line c d at d . Do the same from f to b , and draw the right ...
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*.