Bengt, Stephen Vincent. **§ 5121.29 Electro-ballistic machines and the Schultz’ chron- oscope,. 2d ed. N. Y. Van Nostrand, 1871. 47 pp. Pls. L. 8°.
-Chronoscope.-= GBD 2 -c:20-ca11: stic ma-
chines.-Schueltz, #rancois Philippe Emile.