Treatise on Mathematical Instruments: Their Construction, Adjustment, Testing and Use Concisely ExplainedVirtue Bros. & Company, 1866 - 185 pages |
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... whole of the late MR . WEALE's Publications , contained in the following Cata- logue , have been purchased by VIRTUE BROTHERS & Co. , and that all future Orders will be supplied by them at 26 , Ivy LANE . Additional Volumes , by Popular ...
... whole of the late MR . WEALE's Publications , contained in the following Cata- logue , have been purchased by VIRTUE BROTHERS & Co. , and that all future Orders will be supplied by them at 26 , Ivy LANE . Additional Volumes , by Popular ...
Page 1
... Whole and halves . Proportional compasses . Triangular compasses . Marquois's scales . Beam compasses . Plotting scales . The pantagraph . Sliding Rule . ON DRAWING COMPASSES , This instrument consists of two legs moveable about a joint ...
... Whole and halves . Proportional compasses . Triangular compasses . Marquois's scales . Beam compasses . Plotting scales . The pantagraph . Sliding Rule . ON DRAWING COMPASSES , This instrument consists of two legs moveable about a joint ...
Page 8
... whole operation of drawing the line . For drawing close parallel lines in mechanical and architec- tural drawings , or to represent canals or roads , a double pen ( fig . 2 ) is frequently used , with an adjusting screw to set the pen ...
... whole operation of drawing the line . For drawing close parallel lines in mechanical and architec- tural drawings , or to represent canals or roads , a double pen ( fig . 2 ) is frequently used , with an adjusting screw to set the pen ...
Page 11
... whole extent of the scale . Take off now , with the compasses , eleven of these subdi- visions , set the extent off backwards from the end of the first 100 10 4 primary division , and it will reach SCALES OF EQUAL PARTS . 11.
... whole extent of the scale . Take off now , with the compasses , eleven of these subdi- visions , set the extent off backwards from the end of the first 100 10 4 primary division , and it will reach SCALES OF EQUAL PARTS . 11.
Page 15
... whole length of the line of hours , of the angles , of which the tangents are equal to the sines of the latitudes . The middle of the hour line being numbered for three o'clock , the divisions for the other hours are found by setting ...
... whole length of the line of hours , of the angles , of which the tangents are equal to the sines of the latitudes . The middle of the hour line being numbered for three o'clock , the divisions for the other hours are found by setting ...
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.
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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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