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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... Glass , or Glass Staining , the Art of ; com- prising Directions for preparing the Pigments and Fluxes , for laying them upon the Glass , and for Firing or Burning in the Colours . From the German of Dr. GESSERT . To which is added în ...
... Glass , or Glass Staining , the Art of ; com- prising Directions for preparing the Pigments and Fluxes , for laying them upon the Glass , and for Firing or Burning in the Colours . From the German of Dr. GESSERT . To which is added în ...
Page 53
... glass called a copying glass , and the paper to receive the copy placed over the drawing . The glass is then fixed in such a position as to have a strong light fall upon it from be- hind , and shine through it . By this means the ...
... glass called a copying glass , and the paper to receive the copy placed over the drawing . The glass is then fixed in such a position as to have a strong light fall upon it from be- hind , and shine through it . By this means the ...
Page 73
... glass and crown glass , which are fitted close together , and are of such focal lengths that the chromatic dispersion of one is counteracted by the chromatic dispersion of the other . The effect of the chromatic dispersion upon an ...
... glass and crown glass , which are fitted close together , and are of such focal lengths that the chromatic dispersion of one is counteracted by the chromatic dispersion of the other . The effect of the chromatic dispersion upon an ...
Page 75
... glass silvered at the back ; and , as reflection takes place at each surface of the glass , there is formed a secondary image , which must not be mistaken for the primary and distinct image intended to be observed . ON CURVILINEAR ...
... glass silvered at the back ; and , as reflection takes place at each surface of the glass , there is formed a secondary image , which must not be mistaken for the primary and distinct image intended to be observed . ON CURVILINEAR ...
Page 76
... glass ; and , without its use , we have not hitherto been able to form available achromatic ob- ject - glasses . Recourse is , therefore , had to parabolic or spherical specula in the formation of telescopes of large power for examining ...
... glass ; and , without its use , we have not hitherto been able to form available achromatic ob- ject - glasses . Recourse is , therefore , had to parabolic or spherical specula in the formation of telescopes of large power for examining ...
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 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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