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 65
Page 4
... length Fig 2 с B Fig 1 A of the shorter , when the former are opened to any given line , the shorter ones will be opened to the half of that line . By their means , then , all the lines of a drawing may be reduced to one - half , or ...
... length Fig 2 с B Fig 1 A of the shorter , when the former are opened to any given line , the shorter ones will be opened to the half of that line . By their means , then , all the lines of a drawing may be reduced to one - half , or ...
Page 5
... lengths of the lines upon a drawing , the points D and E will prick off a copy with the lines reduced in the ... length of any radius , the points and E will prick off a polygon of that number of sides , in B the circle described ...
... lengths of the lines upon a drawing , the points D and E will prick off a copy with the lines reduced in the ... length of any radius , the points and E will prick off a polygon of that number of sides , in B the circle described ...
Page 6
... lengths of the opposite ends of the compasses , when the line across the slider is set to those numbers ; so that , when this line is set to the division marked 2 upon the scale of solids , the distance between the points A and B will ...
... lengths of the opposite ends of the compasses , when the line across the slider is set to those numbers ; so that , when this line is set to the division marked 2 upon the scale of solids , the distance between the points A and B will ...
Page 10
... length of the primary divisions ; and through each of these di- visions draw perpendicular lines , cutting all the eleven parallels , and number these pri- mary divisions , 1 , 2 , 3 , & c . , beginning from the second . Subdivide the ...
... length of the primary divisions ; and through each of these di- visions draw perpendicular lines , cutting all the eleven parallels , and number these pri- mary divisions , 1 , 2 , 3 , & c . , beginning from the second . Subdivide the ...
Page 11
... length . In one , the distances between the primary divisions are each half an inch , and in the other a quarter of an inch . The parallel next to the figures numbering these divisions must be considered the highest or first parallel in ...
... length . In one , the distances between the primary divisions are each half an inch , and in the other a quarter of an inch . The parallel next to the figures numbering these divisions must be considered the highest or first parallel 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...
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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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