Instantaneous fuse design

Methylpyridinium ions (181) react reversibly with hydroxide to form a small proportion of the pseudo-base (182). The term pseudo is used to designate bases that react with acids measurably slowly, not instantaneously as for normal acid-base reactions. Fused benzene rings reduce the loss of resonance energy when the hetero ring loses its aromaticity and hence pseudo-bases are formed somewhat more readily by 1-methylquinolinium, 2-methylisoquinolinium and 10-methylphenan-thridinium, and much more readily by 10-methylacridinium ions. Pseudo-bases carrying the hydroxy group in the a-position are usually formed preferentially, but acridinium ions react at the y-position. 

Detonator Assemblies, Non-Electric for blasting Non-electric detonators assembled with and activated by such means as safety fuse, shock tube, flash tube or detonating cord. The[y] may be of instantaneous design or incorporate delay elements. Detonating relays incorporating... 

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