A Rotary Spark Gap is required in every transmitting station by the Federal authorities, for the reason that this type of gap pruduces a pure wave of low damping decrement. It also increases the efficiency of any transmitting station from 20 to 30 per cent.
This Rotary Spark Gap emits a high musical note, more audible to the human ear, can be head at greater distances than the note from the stationary type, and cannot be mistaken for static or other atmospheric disturhances, a fault common with the stationary gap due to its low frequency note.
The rotating member has twelve sparking points mounted on a hard rubber disk and is carried on the motor shaft.
Also fitted with two stationary electrodes with special adjusting devices.
The Gap can be successfully used on any of our spark coils or transformers up to and including 1 K. W. capacity.
Our standard Globe Motor is used, which will operate on 110 A. C. or D. C. circuits and attains a speed of 4,500 R.P.M. Also made with our Globe Battery Motor, which can be operated on a six-volt circuit.
| List. No. | Price | |
| 222 | Mesco Rotary Spark Gap. 6 volt | $12.00 |
| 223 | 13.00 | |
| 216 | 5.00 |