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"Have to get another spark-coil!" In times of sickness even the sternest man submits to medical tyranny. I ran down a man who once owned a power boat, and he had a spark coil. He finally agreed to forgo the pleasure of possessing it for a suitable reward. Considering the size of that reward, he had undoubtedly become greatly attached to his spark-coil! I returned in triumph to the doctor.
The simplest kind of a wireless telegraph transmitter consists of: a source of direct or alternating current, a telegraph key, a spark-coil or a transformer, a spark gap, an adjustable condenser and an oscillation transformer.
There are many different makes and styles of these parts but in the last analysis all of them are built on the same underlying bases and work on the same fundamental principles. The Spark-Coil.
Finally their outfit was reduced to two fishing-rods, one hatchet, a first-aid kit, a flash-light, the necessary food and dishes, one canteen, and one pistol, with the wireless equipment. This was made as simple as possible. Six new dry cells were to be taken to provide current. Then there were a spark-gap, a spark-coil, a key, and a detector, with the receiving set, switch, and aerial.
Where you have to generate the current with a battery you must use a spark coil, but if you have a 110-volt direct or alternating lighting current in your home you can use a transformer which will give you more power. For this set you will need: a spark-coil, a battery of dry cells, a telegraph key, a spark gap, a high-tension condenser, and an oscillation transformer.
Either a fixed, a rotary, or a quenched spark gap can be used with this set, but the former is seldom used except with spark-coil sets, as it is very hard to keep the sparks from arcing when large currents are used.
The plain spark-gap is more suitable for small spark-coil sets, and it is not so apt to break down the transformer and condenser of the larger sets as the rotary gap. The rotary gap on the other hand tends to prevent arcing and so the break is quicker and there is less dragging of the spark. The quenched gap is more efficient than either the plain or rotary gap and moreover it is noiseless.
The simplest kind of a wireless telegraph transmitter consists of: a source of direct or alternating current, a telegraph key, a spark-coil or a transformer, a spark gap, an adjustable condenser and an oscillation transformer.
The plain spark-gap is more suitable for small spark-coil sets, and it is not so apt to break down the transformer and condenser of the larger sets as the rotary gap. The rotary gap on the other hand tends to prevent arcing and so the break is quicker and there is less dragging of the spark. The quenched gap is more efficient than either the plain or rotary gap and moreover it is noiseless.
There are two ways to set up the sparks and these are: with an induction coil, or spark-coil, as it is commonly called, and with an alternating current transformer, or power transformer, as it is sometimes called.
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