Journal of shellfish research.

v. 15 (1996)

Journal de botanique.

t. 5 (1891)

Journal de botanique.

ser. 2, t. 2 (1909)

Journal de botanique.

t. 20 (1906)

Journal de botanique.

ser. 2, t. 1 (1907-1908)

Journal of shellfish research.

v. 23 (2004)

Journal de botanique.

t. 2 (1888)

Journal de botanique.

t. 4 (1890)

Journal de botanique.

t. 7 (1893)

Journal of shellfish research.

v. 22 (2003)

Journal de botanique.

t. 17 (1903)

Journal de botanique.

t. 18 (1904)

Um chronographo de construção simples, permittindo registrar intervallos de tempo de 1 a 60 segundos

Descriptive memorial of a chronograph made from a common chronoscop (Eastman Timer). The chronoscop has been modified in order to permit to adjust distinct cog-wheels, everyone in its turn, to the axis of the seconds hand. Each of these cog-wheels holds a definite number of teeth accordingly with the time interval ones desire to record. A wheel with 20 teeth, for instance, is available for recording time in periods of each three seconds, another wheel with 6 teeth, will reckon time in intervals of 10 seconds and so on. These wheels may be interchanged most easily, which enables, with the same apparatus, to have at hand a time recorder for any time interval between one and sixty seconds. To register the time the apparatus is connected with a dry cell. A wire is attached to a binding post on the metal case of the apparatus, another wire being connected with an isolated binding post placed in front of the cog-wheel and fastened to a platinum point allowing open or shut the circuit, every time one of the cogs of the wheel comes into contact with this platinum point. A signal magnet is placed also in the circuit for writing the time intervals on the revolving drum.

The Ohio journal of science.

v. 1-3 (1900-1903)

The Ohio journal of science.

v. 4-6 (1903-1906)