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" The two parallel plates are connected together by the ball and socket already mentioned, and are set firm by four mill-headed screws, which turn in sockets fixed to the lower plate, while their heads press against the under side of the upper plate, and... "
A Rudimentary Treatise on Land and Enigineering Surveying with All the ... - Page 124
by Thomas Baker - 1850 - 218 pages
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - Astronomical instruments - 1834 - 134 pages
...microscope, E, half, or even quarter, minutes can easily be estimated. Beneath the parallel plates is a female screw adapted to the staff head, which is connected by brass joints to three mahogany legs, so constructed that when shut up they form one round staff,...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical, and ...

Benjamin Pike - Science - 1848 - 356 pages
...directions; the instrument by this means is set up level for observation. Beneath the parallel plates is a female screw adapted to the staff head, which is connected by brass joints to three mahogany legs, so constructed that when shut up they form one round staff,...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical and ...

Benjamin Pike (Jr.) - Scientific apparatus and instruments - 1848 - 482 pages
...directions ; the instrument by this means is set up level for observation. Beneath the parallel plates is a female screw adapted to the staff head, which is connected by brass joints to three mahogany legs, so constructed that when shut up they form one round staff,...
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A Treatise on Mathematical Instruments ...

John Fry Heather - 1849 - 202 pages
...against the under side of the upper plate, and thus serve the purpose of setting the instrument up truly level. Beneath the lower parallel plate is a female screw, adapted to the staff-head, which is connected by brass joints with three mahogany legs, so constructed, as to shut...
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A Manual of Surveying for India, Detailing the Mode of Operations on the ...

Sir Henry Edward Landor Thuillier - Surveying - 1851 - 826 pages
...against the under side of the upper plate, and thus serve the purpose of setting the instrument up truly level. Beneath the lower parallel plate is a female screw, adapted to the staff-head, which is connected by brass joints with three mahogany legs, so constructed, as to shut...
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A Treatise on Mathematical Instruments: Including Most of the Instruments ...

John Fry Heather - Angles (Geometry) - 1859 - 198 pages
...against the under side of the upper plate, and thus serve the purpose of setting the instrument up truly level. Beneath the lower parallel plate is a female screw, adapted to the staff-head, which is connected by brass joints with three mahogany legs, so constructed as, when shut...
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Elementary Treatise on Land Surveying and Levelling ...

Robert Thornton (Engineer.) - 1863 - 144 pages
...four screws with millheads, and serve the purpose of setting the instrument truly level. On the lower plate is a female screw, adapted to the staff head,...connected with brass joints to three mahogany legs, made in the same way as those described for supporting the theodolite. The spirit level LL is fixed...
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Rudimentary treatise on mensuration and measuring

Thomas Baker (C.E.) - 1865 - 174 pages
...distances between two stations: of these there are several, we shall only here describe the Y level. THE Y LEVEL. The foregoing figure represents this...connected with brass joints to three mahogany legs, which support the instrument. The spirit level / / is fixed to the telescope by a joint at one end,...
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Treatise on Mathematical Instruments: Their Construction, Adjustment ...

John Fry Heather - Mathematical instruments - 1866 - 228 pages
...against the under side of the upper plate, and thus serve the purpose of setting the instrument up truly level. Beneath the lower parallel plate is a female screw, adapted to the staff-head, which is connected by brass joints with three mahogany legs, so constructed as, when shut...
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Land and marine surveying

William Davis Haskoll - 1868 - 252 pages
...directions. The instrument by these means is set up level for observat on. Beneath the parallel plates is a female screw adapted to the staff head, which is connected by brass joints to three mahogany legs. We should hardly have mentioned these, but for the fact, that...
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