spark-gap, with the hyphen, means the air-gap between the opposed faces of the electrodes in which sparks are produced.
An interesting experiment is found in placing a spark-gap in the flame and sending a series of sparks across it.
Chub grabbed the key and rattled away at it until the spark-gap was fairly blue.
While Lew was writing down for him the wireless alphabet, Charley was showing him how to make the letters on the spark-gap.
A small porcelain clip carrying the spark-gap wires is held on the top of the burner chimney.
Joyously he adjusted his spark-gap until he had a fine, fat stream of fire leaping between the posts.
"Willie might be listening in," he explained, as the sparks began to leap between the points of his spark-gap.
Almost immediately after Dawson disappeared the crash of the spark across the spark-gap and up the wires was heard.
S is the spark-gap between magnesium terminals connected to the outer coats of the Leyden jars.
At first it was customary to place the spark-gap in the wire leading from the antenna to the earth, as in the accompanying sketch.
|spark gap |
A gap in an otherwise closed electric circuit across which a discharge occurs at a prescribed voltage. The discharge often causes ionization of the surrounding gas and thereby very high temperatures, and can be exploited, as in spark plugs, to ignite engine fuel in a combustion chamber.