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 10
... correctly in- dicated , as will easily be understood from its construction , which we proceed to describe . Draw eleven parallel equidistant lines ; divide the upper of these lines into equal parts of the intended length of the primary ...
... correctly in- dicated , as will easily be understood from its construction , which we proceed to describe . Draw eleven parallel equidistant lines ; divide the upper of these lines into equal parts of the intended length of the primary ...
Page 51
... correctly set , the tracing point , pencil , and fulcrum will be in one straight line , as shown by the dotted line in the figure . The motions of the tracing point and pencil are then each compounded of two circular motions , one about ...
... correctly set , the tracing point , pencil , and fulcrum will be in one straight line , as shown by the dotted line in the figure . The motions of the tracing point and pencil are then each compounded of two circular motions , one about ...
Page 53
... correct situation upon the copy , and passing a blunt tracing point * over the lines drawn upon it . Second Method . - A sheet of tracing paper having the under side rubbed over with powdered black lead may be placed upon the paper ...
... correct situation upon the copy , and passing a blunt tracing point * over the lines drawn upon it . Second Method . - A sheet of tracing paper having the under side rubbed over with powdered black lead may be placed upon the paper ...
Page 54
... correct copy of the original will be produced , and of half the original scale . Commencing then at A , observe where , in the original , the angle a falls , which is towards the bottom of the square marked on the top d e . In the ...
... correct copy of the original will be produced , and of half the original scale . Commencing then at A , observe where , in the original , the angle a falls , which is towards the bottom of the square marked on the top d e . In the ...
Page 55
... correct reduced copy of the original line . Pro- ceed in like manner with every other line on the plan , and its various details , and you will have the plot or drawing , laid down to a small scale , yet bearing all the proportions in ...
... correct reduced copy of the original line . Pro- ceed in like manner with every other line on the plan , and its various details , and you will have the plot or drawing , laid down to a small scale , yet bearing all the proportions in ...
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*.