The nature of ignition and propagation problems and how priming can overcome most of these problems can be difficult to comprehend.However,a qualitative understanding of these problems and their solution can be facilitated through the use of ignition and propagation energy diagrams,such as used by Shimizu.These diagrams are a clever combination of a sketch and a graph,see Figure 1.The lower portion of the diagram is simply a sketch of a stick of pyrotechnic composition similar to that discussed in the previous article.The composition is shown as initially having a burning surface a-b,which has burned to the current burning surface a'-b'.Above the sketch is a graph of energy as a function of distance along the composition.Here the two terms from the propagation inequality are charted (also discussed in the previous article).The energy being fed back,E_f,is shown as a dashed line and the activation energy,E_a,is shown as a solid line.
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