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. Author manuscript; available in PMC: 2015 Oct 23.
Published in final edited form as: Int J Audiol. 2013 Feb;52(0 1):S9–19. doi: 10.3109/14992027.2012.745650

Figure 4.

Figure 4

Picture of .32 H&R revolver (top panel) and .32 H&R starter pistol (bottom panel) both firing blank cartridges. The pattern of gas escape as evidenced by the black powder smoke is to the front for the open-barreled revolver and to the sides for the starter pistol. These images have been contrast-enhanced to increase visibility of the black powder smoke pattern.