L.-J. Gruey, Le Strephoscope Universel...Construit par M. Collin... Paris, Imprimerie Chaix, 1883. 9.5x6", 32pp, with descriptions of 14 devices, each with a small text illustration. In the original wrappers, with the text block becoming loose in the wrappers. Also includes a double-page illustration of the Gruey machine. GOOD copy of a scarce title. $125
A description of this gyroscope demonstration device:
“This device is nothing more than a new Gyroscopic box, of a particular composition...to highlight, for all, important and curious events in general mechanics or celestial mechanics, which were known only to scientists. The essential part of a gyroscopic apparatus is a bronze torus, with a cylindrical steel shaft. The ends of the shaft, cut into very thin points...fixed on a ring metallic, in two diametrically opposite points...We will briefly describe how to compare put each device with the pieces of our box, and that of executing experiments. We will not reproduce here the complete theory and rigorous of these devices exposed elsewhere, but we will give at the end of the description of each of them, under the heading 'Explanation'...”
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