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
... Lenses 70 Reflectors , Plane 74 Curvilinear 75 Microscopes 76 Telescopes , Refracting 81 Reflecting Solar Microscope 84 Adjusted and Tested 86 88 Camera Obscura • Lucida 89 . 90 PART III . SURVEYING INSTRUMENTS . Page Land Chain Off.
... Lenses 70 Reflectors , Plane 74 Curvilinear 75 Microscopes 76 Telescopes , Refracting 81 Reflecting Solar Microscope 84 Adjusted and Tested 86 88 Camera Obscura • Lucida 89 . 90 PART III . SURVEYING INSTRUMENTS . Page Land Chain Off.
Page 67
... Telescopes . The Camera Lucida . The Camera Obscura . J Such as are adapted to surveying and astronomical instruments , rather fully . Very briefly . THE PRISM . A collection of straight lines , either conical or cylindrical ...
... Telescopes . The Camera Lucida . The Camera Obscura . J Such as are adapted to surveying and astronomical instruments , rather fully . Very briefly . THE PRISM . A collection of straight lines , either conical or cylindrical ...
Page 74
... telescope , ( see page 84 ) , the diagonal eye - piece ( see page 83 ) , & c . When a ray of light , proceeding in a plane at right angles to each of two plane mirrors , which are inclined to each other at any angle whatever , is ...
... telescope , ( see page 84 ) , the diagonal eye - piece ( see page 83 ) , & c . When a ray of light , proceeding in a plane at right angles to each of two plane mirrors , which are inclined to each other at any angle whatever , is ...
Page 76
... telescopes of large power for examining the heavens * . These specula are formed of metal , and the chief objection to them ... telescope is 56 feet long , and the mirror 6 feet wide . The following description of the methods employed in ...
... telescopes of large power for examining the heavens * . These specula are formed of metal , and the chief objection to them ... telescope is 56 feet long , and the mirror 6 feet wide . The following description of the methods employed in ...
Page 78
... telescope is composed of 1264 parts of copper and 589 of tin , fused together and cast in a mould , the bottom of which is formed of hoop iron bound closely together with the edges up- permost . By this means the heat is conducted away ...
... telescope is composed of 1264 parts of copper and 589 of tin , fused together and cast in a mould , the bottom of which is formed of hoop iron bound closely together with the edges up- permost . By this means the heat is conducted away ...
Other editions - View all
Treatise on Mathematical Instruments: Their Construction, Adjustment ... John Fry Heather No preview available - 2016 |
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
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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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