the name given by citizen Gayton (Moreau) to an instrument of glass, constructed in all respects on the principle of Nicholson's Hydrometer, described in the article Hydrostatics, n° 18 (Encycl.) It is therefore needless to give a description of this instrument here; as every artist in glass, who has seen Nicholson's Hydrometer, or understands our description of it, may construct the gravimeter of Moreau; and every man who has made himself master of our article Specific Gravity, may apply the gravimeter to every purpose to which it is applicable. It may just be proper to observe, that Moreau, having at first loaded the small scale or basin G (Plate 240, fig. 9, Encycl.) with a bulb of glass containing a sufficient quantity of mercury, found it expedient afterwards to substitute in the place of this bulb a small mass of solid glass, brought to the proper form and weight by grinding. For a minute account of this instrument, if any of our readers can be supposed to require require a minute account of it, we must refer to the third number of Nicholson's Journal of Philosophy, Chemistry, and the Arts.