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"Our investigation has already shown that once initiated the thrust-effect works best in a very low magnetic field. "Such a low, parallel magnetic field would quite probably be found inside of a simple solenoid coil." "O.K.," Mike answered, "but you have also found that a very high magnetic field is required to initiate the action. How do you get that inside a solenoid without an iron core?"
"Well," he explained as he turned over the notes and sketches, "the primary principle involved in the construction of such a gun consists in impelling the projectile by the magnetic action of a solenoid, the sectional coils or helices of which are supplied with current through devices actuated by the projectile itself.
Can you design a power supply that would achieve that field for that time in a solenoid having ... say ... one per cent as high a field strength as the one we are using here?" "O.K.," said Mike. "I get you. Sounds to me like this thing is going to look like a barrel when we get through with it. "I wish," he added, "that we could get one point one gee. And land this thing on Earth.
The registering apparatus consists of a solenoid, S, that acts upon a soft iron core suspended by a cord from the extremity, x, of the beam of a balance. This cord passes between the channels of two rollers designed, despite the motion of the beam, to keep the core in a vertical position in the center of the solenoid.
Inside the barrel of the electric pen a little plunger, carrying the stylus, travels to and fro at a very high rate of speed, due to the attraction and repulsion of the solenoid coils of wire surrounding it; and as the hand of the writer guides it the pen thus makes its record in a series of very minute perforations in the paper.
We do not see any possibility of employing Latimer-Clark elements; on the contrary, it seems to us indispensable to select piles of large discharge, since the solenoid, S, will attract nothing at all unless a notable quantity of energy is expended in it. Is there a pile of this kind so constant as not to render a rigorously accurate adjustment illusory?
All hands for cutting-up." I pulled on a parka and zipped it up and went out onto the deck. Everybody who wasn't needed at engines or controls was there, and equipment was coming up from below power saws and sonocutters and even a solenoid jackhammer. There were half a dozen floodlights, on small contragravity lifters; they were run up on lines fifty feet above the ship's deck.
Nine ... eight ... seven ... six ... five ... four ... three ... two ... FIRE!" The control officer stabbed the firing button and deep within the Atlas a relay clicked, activating a solenoid that pushed open a valve. A thin stream of Sally's milk shot in from one side of the firing chamber to blend with a fine spray of egg, batter coming from a jet in the opposite wall.
He seems to have overcome the practical difficulty that in order to obtain service velocities with service projectiles an enormous number of windings and a tremendously long barrel are necessary as well as an abnormally heavy current beyond the safe carrying capacity of the solenoid which would raise the temperature to a point that would destroy the coils."
Now, it is not a question here of an open circuit, nor even of infinitely weak currents, since in the line we have a solenoid whose core must set in motion a whole system of connected pieces.
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