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 18
... surface of the sphere , and the primitive to pass through the center , so as to have the eye in its pole , the projection is called stereographic . The projection is further termed equatorial , meridional , or horizontal , according as ...
... surface of the sphere , and the primitive to pass through the center , so as to have the eye in its pole , the projection is called stereographic . The projection is further termed equatorial , meridional , or horizontal , according as ...
Page 19
... surface of the sphere ; the projection of the pole will be the center of the primitive , and the projections of the parallels of lati- tude will be circles de- scribed from the pro- jection of the pole , as center , with distances equal ...
... surface of the sphere ; the projection of the pole will be the center of the primitive , and the projections of the parallels of lati- tude will be circles de- scribed from the pro- jection of the pole , as center , with distances equal ...
Page 64
... surface of a drawing board . The edges of the paper should first be cut straight , and , as nearly as possible , at right angles with each other ; also the sheet should be so much larger than the intended drawing and its margin , as to ...
... surface of a drawing board . The edges of the paper should first be cut straight , and , as nearly as possible , at right angles with each other ; also the sheet should be so much larger than the intended drawing and its margin , as to ...
Page 65
... surface to within an inch of the paste mark , care being taken not to rub or injure the surface in the process . The wetting of the paper in either case is for the purpose of expanding it ; and the edges being fixed to the board in its ...
... surface to within an inch of the paste mark , care being taken not to rub or injure the surface in the process . The wetting of the paper in either case is for the purpose of expanding it ; and the edges being fixed to the board in its ...
Page 66
... surface of the paper , and will destroy the good effect of shading or colouring , if any is afterwards to be applied . The following seven useful rules are taken from Mr. Thomas Bradley's valuable work on Practical Geometry : - " 1 ...
... surface of the paper , and will destroy the good effect of shading or colouring , if any is afterwards to be applied . The following seven useful rules are taken from Mr. Thomas Bradley's valuable work on Practical Geometry : - " 1 ...
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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
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 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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