The San Francisco call., 1898-11-09

workings of the model before going Into a detailed description of how am able to produce these results.
 Elevated on sticks on table in the center of the laboratory stood model of a screw propelled craft, about four feet long and somewhat disproportion- ately wide and deep. MT. Tesla ex- plained that it was merely a working model which he had made in order 10 exhibit it to President Mckinley, and that no attempt had been made to fol- low the usual sharp lines of torpedo boat. The deck was slightly arched and surmounted by three slender standards, the center one being con- siderably higher than the other two, which carried small incandescent bulbs, third bulb being fixed at the bow.
 The keel consisted of a massive cop per plate, the propeller and rudder be- ing in the usual positions. MT. Tesla explained that the boat contained the propelling machinery, consisting Of an electric motor actuated by a storage battery In the hold, another motor to actuate the rudder and the delicate mechanism which performs the tune. tion of receiving through the central standard the electric impulses sent through the atmosphere from the dis tant operating station which set in mo- tion the propelling and steering mo- tors, and through them light or extin- guish the electric bulbs and fire the eX- ploding charge in a chamber in the bow in response to signals sent by the ope- ratOr.
 Now watch" said the inventor, and going to a table on the other side of the room, on which lay a little switch board, about five inches square, he gave the lever sharp turn. Instantly the little bronze propeller began to revolve at a furious rate.
 Now I will send the boat to star hn movement of the lever sent the helm sharp over. and another movement turned it as rapidly back again. At an other signal the screw stopped and re- versed.
 During the day" continued MT. Tesla, his hand on the lever, i've should steer our course by keeping the two standards in line, but at night we should depend upon the electric lights, which would, of course, be screened so as not to be visible to the enemy" and at signal both the tiny bulbs were il- luminated.
 Now we will assume that the boat has arrived withi.l striking distance of the vessel to be destroyed and the bulb in the bow will serve to show that the explosion has taken place"
 AS he spoke he touched the lever again and the light flashed and was eX- tinguished.
 Imagine, if YOU can" said MT. Tesla, as he went back to his desk, what an irresistible instrument of destruction we have in a torpedo boat thus con- trolled. which we can operate day or night, on the surface or below it and from any distance that may be desired. A ship thus assailed would have no pos sible show of escape
 ''I can apply this system of control to | any type of vessel and any one of any size It is not even necessary to make a In Inc At the distance of 100 feet the explosion of 200 pounds of dynamite will exert ! shattering effect on a battleship, but there is no reason wh-- We should not load 6 vessel with 200 or 800 tons or even more of dynamite. which, eXplod- ed even mile or so way would raise a wave that would oVerwhelm the big gest ship ever built"
 Continuing his description, Mir. Tesla said:
 As to that part of my invention which involves the production of suit able waves or radiations and the con- veying of the same to a remote re- ceiving apparatus capable of being op- erated or controlled by their influence, it may be carried out in various ways which are at the present time more or less understood For example, I may pass through a conducting path, pre- ferably enclosing a large area, a rapid ly varying current, and by electro magnetic induction of the same affect a circuit carried by a moving body.
 Tn this case the action at a given distance will be the stronger the larger the area tnclosed by the conductor and the greater the rate of change Of the current If the latter were generated in the ordinary ways the rate of change and consequently the distance at which the action would be practically avail able for the present purpose, would be very small but by adopting such means as I have devised-that is, either by passing through the conducting path currents of a specially designed high frequency alternator, or, better still, at those of a strongly charged condenser a very high rate of charge may be ob- tained, and the effective range of the influence thus extended over a vast area, and by carefully adjusting the circuit on the moving body so as to be in exact electromagnetic synchronism with the primary disturbances this in fluence may be utilized at a great dis tance.
 Another way to carry out my in vention is to direct the currents or dis charges of a high frequency machine or condenser through circuit, one termi- nal of which is connected directly or in ductively with the ground and the other with a body, preferably of large surface and at an elevation. In this case, if the circuit on the moving body be similarly arranged or connected, diff ferenceS of potential on the terminals of the circuit either by conduction or electro-static induction are produced and the same objects attained.
 Still another way is to pass the cur rents simply through the ground by connecting both the terminals of the source of high frequency currents to earth at different and remote points and to utilize the currents spreading through the ground for affecting the re- ceiving circuit properly placed and ad- justed.
 Finally, I may avail myself. in car rying out my invention, of electrical oscillations which do not follow any particular conducting path, but propa- gate in straight lines through space of rays, waves, pulses or disturbances of any kind, capable of bringing the mechanism of the moving body into ac- tion from a distance and at the will of the operator by their effect upon suita- ble controlling devices"
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 LITTLE TROUBLE IN
 GREATER NEW YORK