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 22
Page 15
... middle of the hour line being numbered for three o'clock , the divisions for the other hours are found by setting off both ways from the middle the tangents of n . 15 ° , n . being the number of hours from three o'clock , that is , one ...
... middle of the hour line being numbered for three o'clock , the divisions for the other hours are found by setting off both ways from the middle the tangents of n . 15 ° , n . being the number of hours from three o'clock , that is , one ...
Page 22
... middle parallel of latitude of the country to be represented , and this portion of the cone when developed forms a portion of a sector of a circle . To lay down the meridians and parallels of latitude for this development . 1. Take a ...
... middle parallel of latitude of the country to be represented , and this portion of the cone when developed forms a portion of a sector of a circle . To lay down the meridians and parallels of latitude for this development . 1. Take a ...
Page 26
... middle , and 10 at the end . The half line , then , is taken for unity , or the logarithm of 10 , and , consequently , the whole line represents 2 , or the logarithm of 100. The lengths corresponding to the three first figures of the ...
... middle , and 10 at the end . The half line , then , is taken for unity , or the logarithm of 10 , and , consequently , the whole line represents 2 , or the logarithm of 100. The lengths corresponding to the three first figures of the ...
Page 28
... middle , and units from 1 in the middle to 10 at the end , where the figures 2 , 3 , & c . , stand for 20 , 30 , & c . , as has been explained in the construction . If any of the subdivisions be further subdivided into ten parts , each ...
... middle , and units from 1 in the middle to 10 at the end , where the figures 2 , 3 , & c . , stand for 20 , 30 , & c . , as has been explained in the construction . If any of the subdivisions be further subdivided into ten parts , each ...
Page 33
... middle , is to be made to coincide with the line from which the angle is to be set off , and the stroke in the middle with the point in this line , at which the angle is to be set off ; a mark is then to be made with the pricking point ...
... middle , is to be made to coincide with the line from which the angle is to be set off , and the stroke in the middle with the point in this line , at which the angle is to be set off ; a mark is then to be made with the pricking point ...
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*.