The British Encyclopedia: Or, Dictionary of Arts and Sciences. Comprising an Accurate and Popular View of the Present Improved State of Human Knowledge, Τόμος 5Longman, Hurst, Rees, and Orme, 1809 |
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Σελίδα
... screw upon the end of the tube of a telescope , it may be proved whether they be well centered by fixing the tube and observing , while the cell is unscrewed , whether the cross - hairs keep fixed upon the same lines of an object seen ...
... screw upon the end of the tube of a telescope , it may be proved whether they be well centered by fixing the tube and observing , while the cell is unscrewed , whether the cross - hairs keep fixed upon the same lines of an object seen ...
Σελίδα
... screw at G , and let the line of sight be parallel to the plane of the sector . Now , by turning the whole instrument about the axis , HI , till the plane of it be successively directed , first to one of the stars , and then to another ...
... screw at G , and let the line of sight be parallel to the plane of the sector . Now , by turning the whole instrument about the axis , HI , till the plane of it be successively directed , first to one of the stars , and then to another ...
Σελίδα
... screws . These sockets are cut down in the sides about eight inches , to admit more easily the tube of the telescope ; but when the tube is inserted , it is kept in firm by screw ing up the tightening screws at the end of the sockets at ...
... screws . These sockets are cut down in the sides about eight inches , to admit more easily the tube of the telescope ; but when the tube is inserted , it is kept in firm by screw ing up the tightening screws at the end of the sockets at ...
Σελίδα
... screws ; then adjust that level with these two feet screws ; turn the circle half round , i . e . 180 ° ; and if the bubble be not then right , correct half the error by the screw belonging to the level , and the half error by the two foot ...
... screws ; then adjust that level with these two feet screws ; turn the circle half round , i . e . 180 ° ; and if the bubble be not then right , correct half the error by the screw belonging to the level , and the half error by the two foot ...
Σελίδα
... screw at the end of the arch , and the other half error by the two screws which raise or depress the end of the brass rod . The polar axis remaining nearly horizontal as before , and the declination semi - circle at 0 ° , adjust the ...
... screw at the end of the arch , and the other half error by the two screws which raise or depress the end of the brass rod . The polar axis remaining nearly horizontal as before , and the declination semi - circle at 0 ° , adjust the ...
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