"To obtain the same result by Plante's method, months are required. The entire experiments have been effected with No. 2, which has a surface of two square meters. This apparatus, if charged to saturation, gives 62 ampere hours as its total capacity, and, as in the Plante, this capacity constantly increases with use. The normal rule for the charge is 10 amperes per square meter, and for the discharge double this quantity. This apparatus has always given me on discharging 40 amperes at the E.M.F. of 1.85 volts during 60 or 65 minutes. The charge is effected in two hours up to 20 amperes, without any appreciable loss of electricity.
"The points to be aimed at in an accumulator are longevity and energy, or, rather, rapid yield per kilo. From both points of view accumulators of the Plante type (and consequently those of Montaud) are far superior to those of the Faure type. My opinion, therefore, is that the Montaud accumulator is very practical, that it is a great improvement on the Plante type, and that it can compete successfully with the other systems in use."—Revue Internationale de l'Electricite.
ELECTRIC REGISTERING APPARATUS FOR METEOROLOGICAL INSTRUMENTS.
Mr. E. Gime, whose name is not unknown to our readers, sends us a description of a certain number of meteorological apparatus to which he has applied a peculiar method of registering that it is of interest to make known.
FIG. 1.—DIAGRAM OF GIME'S TELEMAREOGRAPH.
Mr. Gime in the first place has devised a "telemareograph," that is to say, an apparatus designed to register at a distance the curve of the motions of the tide in a given place. The structure of this device, shown diagramatically in Fig. 1, is very simple. It is divided into two distinct parts—a transmitter and a registering apparatus. The transmitter consists of a long glass tube, A, closed at one end and communicating through the other with a receptacle filled with mercury. A barometric vacuum is formed in this tube. The level of the open receptacle corresponds exactly to the level of the lowest tide.
