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 26
Page
... Staff 92 95 Spirit Level Y Level Levelling Staff 96 97 104 Troughton's Levei Gravatt's Levelling , Remarks on Water Level Reflecting Level Prismatic Compass Box Sextant 104 105 106 112 113 115 117 Artificial Horizon Theodolite 121 122 ...
... Staff 92 95 Spirit Level Y Level Levelling Staff 96 97 104 Troughton's Levei Gravatt's Levelling , Remarks on Water Level Reflecting Level Prismatic Compass Box Sextant 104 105 106 112 113 115 117 Artificial Horizon Theodolite 121 122 ...
Page 93
... follower remains at the starting point , and , looking at the mark , or staff , at the other extremity of the line to be measured , directs the leader to extend the chain in the direction of this mark . The leader USE OF THE LAND CHAIN .
... follower remains at the starting point , and , looking at the mark , or staff , at the other extremity of the line to be measured , directs the leader to extend the chain in the direction of this mark . The leader USE OF THE LAND CHAIN .
Page 94
... staff , at the end of the line being also added , gives the entire measurement of the line . Thus , if the arrows have been exchanged 9 times , and if the follower have 4 arrows , and from the arrow last laid down to the end of the line ...
... staff , at the end of the line being also added , gives the entire measurement of the line . Thus , if the arrows have been exchanged 9 times , and if the follower have 4 arrows , and from the arrow last laid down to the end of the line ...
Page 95
... staff . This staff should be 10 links in length , and divided into links . With Gunter's chain the staff , USE OF THE LAND CHAIN . 95 Off-setting Staff.
... staff . This staff should be 10 links in length , and divided into links . With Gunter's chain the staff , USE OF THE LAND CHAIN . 95 Off-setting Staff.
Page 96
... staff , then , will be 6.6 feet , or 6 feet 7.2 inches long , while with the 100 feet chain it will be 10 feet in length . THE SPIRIT LEVEL . Certain parts of the principal instruments used in survey- ing , and in astronomical ...
... staff , then , will be 6.6 feet , or 6 feet 7.2 inches long , while with the 100 feet chain it will be 10 feet in length . THE SPIRIT LEVEL . Certain parts of the principal instruments used in survey- ing , and in astronomical ...
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*.