Systems of delay blasting are discussed with particular reference to their effectiveness in reducing vibrations in the vicinity. It has been established that short-delay blasting does in some cases reduce vibrations appreciably and increase rock breakage. The exact mechanism by which it operates, however, is not yet well enough understood to permit applications with uniform success under a variety of conditions.

A theory of the operation of short-delay blasting is offered as a working hypothesis to guide research and the engineering of shots until experimental data are available.

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