Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing and Use Concisely ExplainedVirtue Bros. & Company, 1866 - 185 pages |
From inside the book
Results 1-5 of 36
Page
... FIELD . Illustrated , 28 . Painting on 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 ...
... FIELD . Illustrated , 28 . Painting on 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 ...
Page 78
... field of view , and all the pencils are necessarily centrical . Microscopes have been made of diamond and sapphire , and the aberration is much less than with glass . Dr. Brewster clean water , and wiped with a smooth chamois skin . In ...
... field of view , and all the pencils are necessarily centrical . Microscopes have been made of diamond and sapphire , and the aberration is much less than with glass . Dr. Brewster clean water , and wiped with a smooth chamois skin . In ...
Page 79
... field of view ; the field - lens ; and the eye - lens . The relations between the focal lengths and intervals of the lenses , and the distance of the diaphragm from the object - lens , are determined , so that the combination may be ...
... field of view ; the field - lens ; and the eye - lens . The relations between the focal lengths and intervals of the lenses , and the distance of the diaphragm from the object - lens , are determined , so that the combination may be ...
Page 80
... field - glass of the negative achromatic eye - piece , called the Huyghenian eye - piece ( p . 82 ) ; and the image formed after the transmission of the rays through the field - glass is viewed through the eye - glass . In the ...
... field - glass of the negative achromatic eye - piece , called the Huyghenian eye - piece ( p . 82 ) ; and the image formed after the transmission of the rays through the field - glass is viewed through the eye - glass . In the ...
Page 81
... field of view should be as bright as possible , the image of the object - glass formed by the eye - glass at the place of the eye should not be larger than the pupil of the eye ; and the brightness will then vary directly as the square ...
... field of view should be as bright as possible , the image of the object - glass formed by the eye - glass at the place of the eye should not be larger than the pupil of the eye ; and the brightness will then vary directly as the square ...
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*.