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Updated: May 24, 2025
A potentiometer puzzled them most, both the making and the application, but they mastered this rather intricate mechanism, as they did the other parts. In this labor, with everything at hand and a definite object in view, no boys ever were happier, nor more profitably employed, considering the influence upon their characters and future accomplishments.
It faded out as the unknown exerted himself to withstand that poignant inquisition, only to come back in, clearer than before, as Seaton advanced the potentiometer still farther. Finally, flesh and blood could no longer resist that lethal probe and the picture became sharp and clear.
Next shunt a potentiometer around the A battery and connect the third post, which connects with the sliding contact, to the negative or zinc pole of a B battery, then connect the positive or carbon pole of it to the negative or zinc pole of a second B battery and the positive or carbon pole of the latter with one end of the primary coil of the second audio frequency transformer and the other end of it to the plate of the first amplifying tube.
With a vacuum tube detector, and especially with one having a gas-content, a potentiometer is very necessary as it is only by means of it that the potential of the plate of the detector can be accurately regulated. The result of proper regulation is that when the critical potential value is reached there is a marked increase in the loudness of the sounds that are emitted by the head phones.
The parts you need for this set include: one variocoupler; one .001 microfarad variable condenser; one .0005 microfarad variable condenser; one .0007 microfarad variable condenser; one 2 megohm grid leak; one vacuum tube detector; one 6 volt A battery; one 6 ohm, 1-1/2 ampere rheostat; one 200 ohm potentiometer; one 22-1/2 volt B battery; one .001 microfarad fixed condenser, one pair of 2,000 ohm headphones, and a variometer.
Seaton crouched over the amplifier, his jaw set and every muscle taut, his eyes leaping from one meter to another, his right hand slowly turning up the potentiometer which was driving more and ever more of the searing, torturing output of his super-power tube into that stubborn brain.
The potentiometer must never be shunted around the B battery or the latter will soon run down. A potentiometer costs a couple of dollars. The Parts and How to Connect Them Up. To wire up the parts connect the leading-in wire of the aerial with the primary coil, which is the middle one of the tuner, and connect the other terminal with the ground.
The parts you need for this set include: one variocoupler; one .001 microfarad variable condenser; one .0005 microfarad variable condenser; one .0007 microfarad variable condenser; one 2 megohm grid leak; one vacuum tube detector; one 6 volt A battery; one 6 ohm, 1-1/2 ampere rheostat; one 200 ohm potentiometer; one 22-1/2 volt B battery; one .001 microfarad fixed condenser, one pair of 2,000 ohm headphones, and a variometer.
Next shunt a potentiometer around the A battery and connect the third post, which connects with the sliding contact, to the negative or zinc pole of a B battery, then connect the positive or carbon pole of it to the negative or zinc pole of a second B battery and the positive or carbon pole of the latter with one end of the primary coil of the second audio frequency transformer and the other end of it to the plate of the first amplifying tube.
I'll get it anyway, you know and you also know that a few hundred volts more will kill you." They saw the thought received, and saw its answer: "You shall learn no more. This is the most important of all, and I shall hold it to disintegration and beyond." Seaton advanced the potentiometer still farther, and the brain picture waxed and waned, strengthened and faded.
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