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Steam will therefore be admitted above the piston and the steam or air which had previously filled the cylinder below the piston will be drawn off to the condenser. It will there encounter the jet of cold water, which is kept constantly playing there by keeping the cock I sufficiently open.
If you are handy with tools, however, you can buy the galena and make your own detector. It will work with more or less satisfaction. Your next need will be the condenser. The condenser consists of a series of aluminum plates, some of which are movable and the rest stationary. Buy a small variable condenser.
A. Not quite perfect; for the cold water entering for the purpose of condensation is heated by the steam, and emits a vapor of a tension represented by about three inches of mercury; that is, when the common barometer stands at 30 inches, a barometer with the space above the mercury communicating with the condenser, will stand at about 27 inches.
Adjusting the No. 2 Set. First adjust the crystal detector with the buzzer set as described above with Set No. 1, then turn the knob of your variable condenser so that the movable plates are just half-way in, pull the secondary coil of your loose-coupled tuner half way out; turn the switch lever on it until it makes a contact with the middle contact point and set the slider of the primary coil half way between the ends.
Connect the ends of the secondary coil, which is the middle one, with the posts of the variable condenser and connect one of the posts of the latter with one post of the fixed .00025 mfd. condenser and the other post of this with the grid; then shunt the grid leak around it.
Supposing quite naturally that the person calling had a shorter wave, he gradually cut out the inductance of his receiver; but the sound faded out entirely, and he returned to his original inductance and shunted in his condenser, upon which the call immediately increased in volume. Evidently the other chap was using a big wave, bigger than Georgetown. Hood puckered his brows and looked about him.
The ship's company had used distilled water, a condenser having been sent out from England; and there had not been a single case of sickness on board since we left, though there were so many cases of fever the few days she lay in the same spot last year.
Swiftly the rays within the condenser began to thicken and increase, and as they did so the seven small circles waxed like stars growing out of the dusk, and with a queer curdled is the best word I can find to define it radiance entirely strange to me. Beneath me I heard a faint, sighing murmur and then the voice of Huldricksson: "It opens the stone turns " I began to climb down the ladder.
The condenser is therefore adjustable and, as you will see from the picture B, it has one terminal wire at one end and three terminal wires at the other end so that one, two or three condensers can be used in series with the aerial. A condenser of this kind costs $5.40. The Aerial Ammeter.
Fresh water was obtained when possible, for Cook remarks, "nothing contributes more to the health of seamen than having plenty of water." He was provided with a condenser, but it was too small and unsatisfactory, and he looked upon it as "a useful invention, but only calculated to provide enough to preserve life without health."
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