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[3] shallow water helmets. [34] Divecomputer.eu – Dive computers. [9] Divematics USA Inc. – Manufacturer of Widolf full-face diving masks since 1980. [35] Divenav – Dive computers. [9] Dive Rite [36] marketed the first commercially manufactured backplates in 1984, [37] and a wing for diving twin cylinders in 1985.
From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...
A civilian Havas submarine [] wet sub. A wet sub is attractive to the amateur or small commercial builder since many of the problems associated with a dry sub are avoided as only the propulsion and power systems need to be waterproof and life support is much less of an issue than it is with a sealed occupant chamber.
A rotary woofer is a subwoofer-style loudspeaker which reproduces very-low-frequency content by using a conventional speaker voice coil's motion to change the pitch (angle) of the blades of an impeller rotating at a constant speed. The pitch of the fan blades is controlled by the audio signal presented to the voice coil, and is able to swing ...
A small notebook of waterproof paper carried by some divers [47] wet pot 1. Water filled hyperbaric chamber, generally for experimental work or training. See Diving chamber#Wet pot 2. Transfer chamber in a saturation system, where the bell is locked on and wet equipment removed after the dive. [48] wetsuit. Main article: Wetsuit
Diving equipment, or underwater diving equipment, is equipment used by underwater divers to make diving activities possible, easier, safer and/or more comfortable. This may be equipment primarily intended for this purpose, or equipment intended for other purposes which is found to be suitable for diving use.