Were reliable high pressure hoses available? The tank pressure gauge I had back in the 60s and early 70s, for checking the amount of gas in a cylinder on land, had no hose. It fit directly on the tank valve. I'm reminded of some problems with those narrow diameter high flex hp hoses just a couple of years ago.
I still find it interesting and still unexplained why local dive shops, including a few large ones in NYC, did not sell, or at least did not have on display, SPGs until the early 70s. I can see from all the information here that they existed long before, but why didn't the shops I used and my NASDS certification course mention them? I sense that something else, some other element, is not being adequately discussed.
I still find it interesting and still unexplained why local dive shops, including a few large ones in NYC, did not sell, or at least did not have on display, SPGs until the early 70s. I can see from all the information here that they existed long before, but why didn't the shops I used and my NASDS certification course mention them? I sense that something else, some other element, is not being adequately discussed.