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 3
... nearly as you can to the required distance , set the fixed leg on the point from which the distance is to be taken , and make the extremity of the other leg coincide accurately with the end of the required distance , by turning the ...
... nearly as you can to the required distance , set the fixed leg on the point from which the distance is to be taken , and make the extremity of the other leg coincide accurately with the end of the required distance , by turning the ...
Page 7
... nearly so .. The blades are set with the points more or less open by means of a mill- headed screw , so as to draw lines of any required fineness or thick- ness . One of the blades is framed with a joint , so that by taking out the ...
... nearly so .. The blades are set with the points more or less open by means of a mill- headed screw , so as to draw lines of any required fineness or thick- ness . One of the blades is framed with a joint , so that by taking out the ...
Page 23
... nearly their due proportions as the nature of the case will admit . M VI We will now briefly explain the manner of con- structing some of the simplest dials . by means of the VI dialling scales . To construct a V Horizontal Dial.- IX XI ...
... nearly their due proportions as the nature of the case will admit . M VI We will now briefly explain the manner of con- structing some of the simplest dials . by means of the VI dialling scales . To construct a V Horizontal Dial.- IX XI ...
Page 27
... nearly so , with the zero point upon our scale , and consequently angles smaller than this cannot be taken off from the sines . This remark applies equally to the line of tangents , the tabulated logarithmic tangent of 34 ' 23 " being ...
... nearly so , with the zero point upon our scale , and consequently angles smaller than this cannot be taken off from the sines . This remark applies equally to the line of tangents , the tabulated logarithmic tangent of 34 ' 23 " being ...
Page 29
... nearly 31 inches , the circumference required . The same thing may also be performed by extending from the first term to the third , and this extent will reach from the third term to the fourth ( Euc . v . prop . 16 ) . Thus , the ...
... nearly 31 inches , the circumference required . The same thing may also be performed by extending from the first term to the third , and this extent will reach from the third term to the fourth ( Euc . v . prop . 16 ) . Thus , the ...
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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