The Newmanry History

56G Page 371

(b) The items of the plugboard

1. Transmitter impulse cut-out switches.

2. Transmitter output jacks, each carrying one of the 5X5 impulses for the 5

3. Addition field : this has 5 rows of jacks, one for each impulse.

4. Sum of impulses : these 5 jacks are the output jacks for the 5 sums of

5. Distributor : these 5 jacks carry the input to the 5 impulses of the

6. Commons : each row constitutes one common jack.

The first impulses (for example) from all five transmitters are added in the

The more important items are described in paras (e) (f) (g) (h) (i).

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