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
... Station Pointer 126 129 131 133 135 135 PART IV . ASTRONOMICAL INSTRUMENTS . Hadley's Sextant Troughton's Reflecting Circle • The Dip Sector • The Transit Instrument Method of Observing with the Transit The Altitude and Azimuth ...
... Station Pointer 126 129 131 133 135 135 PART IV . ASTRONOMICAL INSTRUMENTS . Hadley's Sextant Troughton's Reflecting Circle • The Dip Sector • The Transit Instrument Method of Observing with the Transit The Altitude and Azimuth ...
Page 52
... station , and the pencil and tracing point those on the exterior arms , A B and A C , of the instrument . The successful use of the pantagraph in copying very minute and complicated drawings can only be attained by perseverance and ...
... station , and the pencil and tracing point those on the exterior arms , A B and A C , of the instrument . The successful use of the pantagraph in copying very minute and complicated drawings can only be attained by perseverance and ...
Page 92
... station pointer . THE LAND CHAIN . Gunter's chain is the instrument used almost universally for measuring the distances required in a survey . For exten- sive and important surveys , however , such as those carried on under the Board of ...
... station pointer . THE LAND CHAIN . Gunter's chain is the instrument used almost universally for measuring the distances required in a survey . For exten- sive and important surveys , however , such as those carried on under the Board of ...
Page 96
... stations . b The spirit level consists of a glass tube , differing from the cylindrical form by having its diameter largest in the middle , and decreasing slightly and with great regularity from the middle to the ends . The tube is ...
... stations . b The spirit level consists of a glass tube , differing from the cylindrical form by having its diameter largest in the middle , and decreasing slightly and with great regularity from the middle to the ends . The tube is ...
Page 97
... station when the angles are moved a little round the pivots of suspension . " Fourthly , the opposite ends of the ... stations . Of spirit levels for this purpose there are now three in use , namely , the Y level , Troughton's improved ...
... station when the angles are moved a little round the pivots of suspension . " Fourthly , the opposite ends of the ... stations . Of spirit levels for this purpose there are now three in use , namely , the Y level , Troughton's improved ...
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*.