Black Powder Delay Elements

Section 4, Part F b) Black Powder Delay Elements 

By proper control of BkPdr composition and granulation, it is possible to obtain delay times from 4 milliseconds to 1 minute, but the range for individual elements is not so wide 

In the Figs which follow, some BkPdr delay elements and delays used in US Navy and Army fuzes are shown 

The elements A B of Fig 1-46 are obturated column types, while C is vented column type, D vented ring type and E pressure type delay (Ref 23, pp 5-1 to 5-18) 

Delay Element B (Fig 1-46) is,also column type, but it is provided with a baffle. The function of the baffle is explained in Glossary, Section 2, Part A 

---

Delay elements may be classified accdg to the type of chge employed, such as black powder delays, gasless delays, and delays... 

Transfer lines between prime ignition and first fire must be regarded as a part of the secondary ignition system. Quickmatch, a type of black powder fuse that has a more-or-less well-defined burning time and thus acts as a delaying element, will be described in the next chapter. It becomes a nearly-instantaneous transfer line if enclosed in a narrow paper tube and is thus used as piped match in fireworks for simultaneous initiation of several effects. ... 

---