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units in the Department are classified under three heads;
 (a) Mechanical means of communication
 (b) Couriers.
 (c)Personal Liaison

2. Mechanical means of communications include:
 (a) Wire Communications.
   1. Telephone.
   2. Telegraph.
 (b) radio Communications.
   1. Telephone.
   2. Telegraph.
(c) Visual Signals.
   1. Panels.
   2. Pyrotechnics.
   3. Projectors.

3. Wire communications are at present classified under two headings 
  1. Actual
  2. Contemplated
  (a) The Telephone (wire)

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