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 16
... meridian denoted by the several points and quarter points of the compass , enabling the navigator , without computation , to lay down or measure a ship's course upon a chart Thus , supposing the ship's course to be N.N.E. E. Through the ...
... meridian denoted by the several points and quarter points of the compass , enabling the navigator , without computation , to lay down or measure a ship's course upon a chart Thus , supposing the ship's course to be N.N.E. E. Through the ...
Page 17
... meridian A B , and with center A and distance equal to the extent of 60 ° upon the line of chords describe an arc cutting A B in B ; then on the line of rhumbs take the extent to the third subdivision beyond the division marked 2 ...
... meridian A B , and with center A and distance equal to the extent of 60 ° upon the line of chords describe an arc cutting A B in B ; then on the line of rhumbs take the extent to the third subdivision beyond the division marked 2 ...
Page 18
... meridian or horizon of any place . 30 60 60 30 To delineate the Orthographic Projection of the Circles of the Terrestrial Sphere upon the Plane of the Meridian of any place . With a radius according to the contemplated scale of the pro ...
... meridian or horizon of any place . 30 60 60 30 To delineate the Orthographic Projection of the Circles of the Terrestrial Sphere upon the Plane of the Meridian of any place . With a radius according to the contemplated scale of the pro ...
Page 19
... meridian for the longitudes . In the figure the primitive coincides with the plane of the meridian of a place in 30 ° west longitude , or 150 ° east longi- tude , the sum of these two being 180 ° , as must always be the case . To ...
... meridian for the longitudes . In the figure the primitive coincides with the plane of the meridian of a place in 30 ° west longitude , or 150 ° east longi- tude , the sum of these two being 180 ° , as must always be the case . To ...
Page 20
... meridian for the longitudes . With the tan- gents of the colatitudes , taken at intervals equal to the angle between two successive meridians , and reduced to the radius of the primitive , as distances , describe from the center of the ...
... meridian for the longitudes . With the tan- gents of the colatitudes , taken at intervals equal to the angle between two successive meridians , and reduced to the radius of the primitive , as distances , describe from the center of 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...
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*.