Relays and relay detonators

The term relay is defined at the beginning of this Section. To this definition may be added the following description of a relay detonator, which is taken from Ref 23, pp 5-30 to 5-33 and slightly reworded and abbreviated  

After expiration of the delay time, a substantial spurt of flame is needed to initiate the main detonator of the fuze, demolition device, or other Ordnance item. Since the 

In Fig 5-27 taken from Ref 23, p 5-31 (See our Fig 1-64), is shown a relay detonator which has given satisfactory results in 7 and 7.7-sec vented delay elements in the temperature range of -65 °F to 160 °F. The lightly pressed BkPdr chge at the terminal end of the vented delay column is provided to produce sufficient heat and pressure to assure reliable initiation of the LA chge. 

A thin paper disk should be provided to prevent contact between BkPdr and A1 container for LA 

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