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The article discusses two classic books on diving, "Shallow Water Diving for Pleasure and Profit" (1950) and "Shallow Water Diving and Spearfishing" (1954), written by Hilbert Schenck and Henry Kendall. These books document the transformation of diving from a professional activity to a sport. The authors, Schenck and Kendall, had backgrounds in diving technology and presented the material in a methodical and interesting manner. The books cover various diving technologies, including helmets, wet/dry suits, and spearguns, and provide tips on how to go about diving. The authors' lives and accomplishments are also briefly discussed. [Extracted from the article]

The article focuses on the history of the invention and use of the Ohgushi Peerless Respirator developed by Riichi Watanabe, Kanezo Ohgushi and Kyuhachi Kataoka. Topics include invention of the Respirator by Watanabe and Ohgushi, both of whom are from Japan, and the original version of the Respirator. Improvement of this original version by Watanabe and diving professional Kyuhachi Kataoka is also discussed. Salvage operations using the Respirator are then discussed.