 | Frederick Walter Simms - 1834 - 134 pages
...observer looks through in observing with the instrument. The perpendicular thread of the sight-vane, E, and the divisions on the card appear together on...thread coincides, when the needle is at rest, is the magnetic azimuth of whatever object the thread may bisect. The prism is mounted with a hinge joint,... | |
 | Basil Jackson - 1847 - 410 pages
...compass- card, in such a manner as to make the divisions on the card seem a continuation of the thread ; and the division with which the thread coincides, when the needle is at rest, is the magnetic azimuth of whatever object the thread may bisect. A hinge-joint connects the prism with the... | |
 | Benjamin Pike - 1848 - 356 pages
...observer looks through in observing with the instrument. The perpendicular thread of the sight-vane, E, and the divisions on the card appear together on...thread coincides, when the needle is at rest, is the magnetic azimuth of whatever object the thread may bisect. The prism is mounted with a hinge joint,... | |
 | Benjamin Pike (Jr.) - 1848 - 482 pages
...instrument. The perpendicular thread of the sight-vane, E, and the divisions on the card appear toget/ier on looking through the prism, and the division with...thread coincides, when the needle is at rest, is the magnetic azimuth of whatever object the thread may bisect. The prism is mounted with a hinge joint,... | |
 | Sir Henry Edward Landor Thuillier - 1851 - 826 pages
...observer looks through in observing with the instrument. The perpendicular thread of the sightvane, E, and the divisions on the card appear together on...thread coincides, when the needle is at rest, is the magnetic azimuth of whatever object the thread may bisect. The prism is mounted with a hinge-joint,... | |
 | Benjamin Pike - 1856 - 412 pages
...observer looks through in observing with the instrument. The perpendicular thread of the sight-vane, E, and the divisions on the card appear together on looking through th< prism, and the division with which the thread coincides when the needle is at rest, is the magnetic... | |
 | William Mitchell Gillespie - 1868 - 530 pages
...through. The perpendicular thread of the sight-vane, E, and the divisions on the card, appear tec/ether on looking through the prism, and the division with...direction of the needle. The prism is mounted with a hingo joint, D. The sight-vane has a fine thread stretched along its opening, in the direction of its... | |
 | William Davis Haskoll - 1868 - 252 pages
...weather. p is the prism through which the surveyor observes. The perpendicular wire of the sight vane, v, and the divisions on the card, appear together on looking through the prism ; that particular division on the card, with which the wire coincides, when the needle is at rest,... | |
 | William Mitchell Gillespie - 1880 - 540 pages
...degree. C is a prism, which the observer looks through. The perpendicular thread of the sight.vane, E, and the divisions on the card, appear together...is the angle which the line of sight makes with the dtrection of the needle. The prism is mounted with a hinge joint, D. The sight.vane has a fine thread... | |
 | William Davis Haskoll - 1886 - 354 pages
...weather. p is the prism through which the surveyor observes. The perpendicular wire of the sight vane, v, and the divisions on the card, appear together on looking through the prism ; that particular division on the card with which the wire coincides, when the needle is at rest, is... | |
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C is a prism which the observer looks through. The perpendicular thread of the sight.vane, E, and the divisions on the card appear together on looking through the prism, and the division with which the thread coincides when the needle is at rest, is the... 
