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The dynamos are completed, and were put in place on the 20th October, when M. Deprez carried out some preliminary tests in the presence of a commission consisting of MM. Collignon, Inspector-General des Ponts et Chaussées; Delebecque, Ingenieur en Chef du Materiel et de la Traction of the Northern Railway of France; Contanini, engineer in the same company; and Sartaux.
Although Baily, Deprez, and Ferraris had accomplished much before Tesla's time, yet it was practically to the investigations and discoveries made by Tesla, between 1887 and 1891, that the induction motor of to-day is due.
The colorful lines of the half-breed Déprez drifted through my mind: And there he lies now, and nobody knows; And the summer shines, and the winter snows, And the little gray hawk floats aloft in the air, And the gray coyote trots about here and there, And the buzzard sails on, And comes back and is gone, Stately and still like a ship on the sea; And the rattlesnake slides and glitters and glides Into his rift in a cottonwood tree.
For drying substances which act on copper the basket may be made of platinum or ebonite; in the latter case, owing to the increased size of the perforations, it may be necessary to line the basket with platinum wire gauze or perforated parchment paper. The experiments of M. Marcel Deprez have entered on a decisive phase.
Déprez, Les Préliminaires de la Guerre de Cent Am, pp. 400-406, admirably elucidates the situation. On which side did the responsibility for the war rest? National prejudices have complicated the question.
But let us look at the other side also. Does science owe nothing to art? Only a short time since the illustrious French physicist, M. Tresca, was enumerating the various sources of loss in the transmission of power by electricity along a fixed wire, as elucidated in the careful and elaborate experiments inaugurated by M. Marcel Deprez, and subsequently continued by himself.
M. Déprez is about to publish a Chancery Roll of Edward II. which includes all the official acts relating to it. Thus, in the summer of 1324 England and France were once more at war. But while England remonstrated and negotiated, France acted. Norman corsairs swept the Channel and pillaged the English coasts. Ponthieu yielded without resistance.
This was to the effect that electricity was conveyed at the cheapest rate through a conductor, the cost of which was such that the annual interest upon the money expended equaled the annual expenditure for lost effect in the conductor in producing the power to be conveyed. It appeared that Mr. Deprez had not followed this law in making his recent installations.
Tresca, and had been communicated a fortnight ago to the French Academy of Sciences. Taking the relative conductivity of iron wire employed by Deprez, and the 3 in. rod proposed by the lecturer, the amount of power that could be transmitted through the latter would be about 4,000 horse power.
But Deprez had employed a motor-dynamo of 2,000 volts, and was contented with a yield of 32 per cent. only of the energy imparted to the primary machine, whereas he had calculated at the time upon an electromotive force of 200 volts, and upon a return of at least 40 per cent. of the energy imparted.
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