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
... Method of Observing with the Transit The Altitude and Azimuth Instrument The Reading Microscope The Collimator · PART V. The Common Goniometer Wollaston's Goniometer ON GONIOMETERS . APPENDIX INDEX 137 141 144 144 151 153 160 182 164 ...
... Method of Observing with the Transit The Altitude and Azimuth Instrument The Reading Microscope The Collimator · PART V. The Common Goniometer Wollaston's Goniometer ON GONIOMETERS . APPENDIX INDEX 137 141 144 144 151 153 160 182 164 ...
Page 15
... method , as follows : - With the chord of 45 ° set off from в to E , and again from B to F , we obtain a quadrant E F bisected in в ; and , the chord of 60 ° or radius being set off from a , C , F , and E , this quadrant is divided into ...
... method , as follows : - With the chord of 45 ° set off from в to E , and again from B to F , we obtain a quadrant E F bisected in в ; and , the chord of 60 ° or radius being set off from a , C , F , and E , this quadrant is divided into ...
Page 22
... methods of pro- jection is usually confined to the representation of an entire hemisphere , or at least of a considerable portion of a sphere ; but for laying down smaller portions of the sphere the method of development may be ...
... methods of pro- jection is usually confined to the representation of an entire hemisphere , or at least of a considerable portion of a sphere ; but for laying down smaller portions of the sphere the method of development may be ...
Page 23
... method is to make the meridian passing through the center of the map , and all the parallels of latitude , straight lines , as in the last method . Then all the degrees on each of the parallels are made proportional to their magnitude ...
... method is to make the meridian passing through the center of the map , and all the parallels of latitude , straight lines , as in the last method . Then all the degrees on each of the parallels are made proportional to their magnitude ...
Page 29
... Method . - Extend from 12 to the number of inches in the breadth , and this extent will reach in the same direc- tion from the number of feet in the length to the number of square feet in the superficial content . Thus the extent for ...
... Method . - Extend from 12 to the number of inches in the breadth , and this extent will reach in the same direc- tion from the number of feet in the length to the number of square feet in the superficial content . Thus the extent for ...
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...
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