Frequency range: ?
Power output: 1/2 kw 120  cycle
Group frequency: 240 sparks per second

Comment:

1) Similar to the P4 and P5 sets but designed to only work on either 300 or 600 meters.
2) For emergency use, a rotary spark gap is mounted on the end of the motor -alternator shaft which may be used in place of the quenched gap if ever required.
3) The transmitter is also provisioned with a type 106 receiver/ tuner, a headphone, an aerial changeover switch and necessary aerial equipment..

Fig 250 -  Type E2 transmitter. This is a special version of the P4 transmitter for  use  in a submarine, Click on image to enlarge   (Source: Manual of the Marconi Institute).

Fig 265 - Rear view of the E2 transmitter.  (From Practical Wireless)

Fig 263 - Wiring diagram of the 1/2 kw 120 cycle, E2 transmitter. Click on image to enlarge. (From Practcal Wireless)

References:

1) Practical Wireless Telegraphy by Elmer E. Bucher, copyright  1917, Oct. 1918 edition
 

Oct 22/20
 
 

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