Sam
Do you have the 1952 manual as well? If so, was the ascent rate in the 1952 manual also 25'/minute? Based on this summary Aqualung-style SCUBA was introduced in Part 3 of the 1959 (1958?) manual.
CLASSIC DIVING BOOKS - US NAVY DIVING MANUAL
I have been curious for years.....
QUOTE]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hombre, I have all the USN diving manuals
I suspect the one you are interested in is the supplement Part 111 which covers "self contained diving" aka SCUBA.
(8-1/2 X 11 cardboard bound 72 pages)
NAVSHIPS 250-538
US Navy Diving manual
Navy department
Washington, D.C.
Part 3
SELF CONTAINED DIVING
No apparent mention of the rate of assent
On page 3.4.7 there is a reproduction of the "duration in minutes" chart which was previously printed in numerous dive training manuals; the Hahn report, Rene Bussoz, Cousteau/Gagnon, ER Cross and LA County Underwater Instructions association's "Underwater Recreation."
I suspect if I reviewed NAVSHIPS 250-538 I will locate a recommended rate of assent. I am currently over loaded with a contract but I will when the pressure less and my time allows.
good luck
SDM