Another Westinghouse H840CK15

[ppppenguin]

Originally Posted by old_tv_nut

"merely silk screened" doesn't quite describe it.

Zworykin and Morton describe the process in "Television" 2nd Ed. 1954. The description seems to be adapted from a 1951 paper by Barnes and Faulkner, but I believe it is the same as in the 15GP22.......

Mullard made a film about colour CRT production in the UK. I'm sure techniques had been refined since 1954 but the basic principles are unchaged: https://www.youtube.com/watch?v=0Qd4IX3wpZk

old_tv_nut said:
"This is the kind of thing that makes me laugh at people who ask why we can't rebuild the Saturn V rocket today to go to the moon again. It's because the tools are gone and those who developed the secret sauce for their use are too. So we have to start from scratch. Now, we may build something much better, but we still are starting from scratch. "

Not just stuff as complicated as a moon rocket. Lot of knowledge about older valve and semiconductor manufacture is also lost. And much else besides. Even if it's all well documented, the formal term for "secret sauce" is tacit knowledge, or tacit skills. The stuff that isn't in the books, often passed on by direct experience. Here at VK and other vintage forums we are helping to keep those skills alive.

https://en.wikipedia.org/wiki/Tacit_knowledge