A guard sat in an enclosed room during meals, and watched the prisoner’s, very carefully, while they ate.
San Francisco Film Locations Then & Now
A Then and Now Tour and History of San Francisco Through Films and Photography
San Francisco Film Locations Then & Now
A Then and Now Tour and History of San Francisco Through Films and Photography
A guard sat in an enclosed room during meals, and watched the prisoner’s, very carefully, while they ate.
San Francisco Film Locations Then & Now 
That guard is my dad. I was able to recreate this photo a number of years ago, as I was a guard’s son, the park rangers gave me access.
Wow! Is that right? That’s a great update, Randy! Thank you for sharing that.