 | Frederick Walter Simms - 1834 - 134 sider
...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,... | |
 | Benjamin Pike - 1848 - 356 sider
...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,... | |
 | Benjamin Pike (Jr.) - 1848 - 482 sider
...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,... | |
 | John Fry Heather - 1849 - 202 sider
...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... | |
 | Sir Henry Edward Landor Thuillier - 1851 - 826 sider
...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... | |
 | John Fry Heather - 1859 - 198 sider
...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... | |
 | Robert Thornton (Engineer.) - 1863 - 144 sider
...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... | |
 | Thomas Baker (C.E.) - 1865 - 174 sider
...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,... | |
 | John Fry Heather - 1866 - 228 sider
...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... | |
 | William Davis Haskoll - 1868 - 252 sider
...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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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... 
