Tubes typical of that era was the smaller electrostatic types and 5up1/7 were of the era. The aviation tubes used for that airborne radar were surrounded by a mumetal shield to keep mag fields out and the graticule was far thicker than the tube. tere were really two generations of tubes used the first ones were the fragile O'scope types and later there were special heavy glass/metal types. Generally It's rare to see a CRT exposed enough to be a hazard as there is always a case (if for HV only) and some kind of graticule. The actual expections were small O'scopes (O1) and hobby scopes. Tubes larger than about 10" didn't appear much till the mid 50s. Getting face full was unlikely due to the graticule and general consturction. I still have a bunch of 2AP1s (2" round green), 3BP1s (3" round green) for projects. These are old tubes (ca 1953/55 date codes!). I also have a modern D170 (2.2x1.8 rectangular) for some project.. Actually earlier, the SAGE system used a larger 12 to 16 inch round with a 10-12KV Accelerator. Heck look at the tube used for the PDP-1 Console. Those were bigger flat face ARTS 1 and II series. If memory serves they were in the 19-21" range. The fragile portion of CRTs is always the neck area. The risk with implosion is the neck/gun assembly will be propelled foward through the screen if the screen shatters. When I was younger I'd scrounge old TVs for the componenents. The CRT being useless to me would get taken out back and put in the junk hole and a big rock heaved in. If it was put in neck first and the face crushed the neck/gun would be propelled 10 to 15 ft on a good shot to a large 19" or bigger CRT and the glass widely scattered in a 10ft or so radius, we avoided that as that meant raking up the remains. The real hazard and I got to see this once is foolish people transporting CRTs without making sure they are properly discharged. One case I did see was a doof carrying a 12" by the neck, minor cuts. The other was a fool carrying a tube from a H1500 terminal. He was careful supporting it but the face with the neck upright. However the HV was still undischarged and found it's way to his chest. CRT was dropped straight down and the neck rebounded off the floor and went straight up into the rooms ceiling tiles. Minor cuts to the lower legs, very lucky. Took a while to sweep that mess up, there was glass everywhere. Allison