Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing and Use Concisely ExplainedVirtue Bros. & Company, 1866 - 185 pages |
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... instruments by which the scientific practitioner is aided in his obser- vations , and in the delineation of the results obtained from them . The instruments treated of have been divided into five classes , to each of which a part of the ...
... instruments by which the scientific practitioner is aided in his obser- vations , and in the delineation of the results obtained from them . The instruments treated of have been divided into five classes , to each of which a part of the ...
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... INSTRUMENTS . Hadley's Sextant Troughton's Reflecting Circle • The Dip Sector • The Transit Instrument Method of Observing with the Transit The Altitude and Azimuth Instrument The Reading Microscope The Collimator · PART V. The Common ...
... INSTRUMENTS . Hadley's Sextant Troughton's Reflecting Circle • The Dip Sector • The Transit Instrument Method of Observing with the Transit The Altitude and Azimuth Instrument The Reading Microscope The Collimator · PART V. The Common ...
Page 1
... instruments , as sold by any mathematical instrument maker ; viz . , Compasses with moveable point , ink point , and pencil point . Hair compasses . Bow compasses . Drawing pen and pricking point . Plain scale . Sector . And we shall ...
... instruments , as sold by any mathematical instrument maker ; viz . , Compasses with moveable point , ink point , and pencil point . Hair compasses . Bow compasses . Drawing pen and pricking point . Plain scale . Sector . And we shall ...
Page 4
... instrument drawings may be reduced or enlarged , so that all the lines of the copy , or the areas or solids ... instrument . To set the instrument it must first be accurately closed , so that the two legs appear but as one ; the 4 ...
... instrument drawings may be reduced or enlarged , so that all the lines of the copy , or the areas or solids ... instrument . To set the instrument it must first be accurately closed , so that the two legs appear but as one ; the 4 ...
Page 7
... instrument , which may be brought to coincide , in the first instance , with any three points on the original , and then transferred to the copy . After this first step two of these points must be set upon two points of the drawing ...
... instrument , which may be brought to coincide , in the first instance , with any three points on the original , and then transferred to the copy . After this first step two of these points must be set upon two points of the drawing ...
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...
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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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