 | Colin Macfarquhar, George Gleig - 1797 - 422 pagina’s
...When it is not level, the bubble will rife to one end. This glafs-tube may be fet in another of brafs, having an aperture in the middle, whence the bubble of air may be obferved. The liquor wherewith the tube is filled is oil of tartar, or aqua fecunda ; thefe not being... | |
 | William Duane - 1810 - 774 pagina’s
...when it is not level, the bubble will rise to one end. This glass tube may be set in another of brass, having an aperture in the middle, whence the bubble of air may be observed. There is one of these instruments with sights, being an improvement upon the last described, which... | |
 | 1816 - 746 pagina’s
...it is not level, the bubble will rife to one end. Thi« glafs tube may be fet in another of brafs, having an aperture in the middle, whence the bubble of air may be obferved. The liquor wherewith the tube is filled is oil of Tartar, or aqua fecunda ; thefe not being... | |
 | John Blenkarn - 1859 - 300 pagina’s
...quarters of an inch in diameter, p. 21 having an aperture in A -„ the middle, whence the =j "J° bubble of air may be observed; this tube is attached to a flat bar, ten inches long, seveneighths broad, and threesixteenths thick, with two plain sights, AB, fixed at... | |
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... ruler wherein it is fixed is level. When it is not level, the bubble will rife to one end. Thi... 