Verityper
Man, you guys are taking me back in a Time Machine, I use to use the LeRoy letting guide back in the Army at Ft, Hood in 1968. Then later I used the Verityper at Texas Instruments in 1985, it used large plastic disk with a negative image of each letter, and you work rotate the type wheel to the desired letter and push the expose button, and a light would expose the letter onto clear film or paper, which ever you had loaded in the machine. You would turn the wheel to the next letter and repeat the process. After setting a line of type, you would remove the cartridge and insert it into the photographic developer, then out came your typeset, black text on the paper or clear film.
We used the clear file for making silkscreen positives and the paper was run thru a waxer to coat the back with wax for the cut-n-pate build up of camera ready artwork. In the photo of me working at the drafting table, you can see the word "WANTED" above the art-board I'm working on, which was typeset withthe Varityper.
Also, a photo of the Verityper typesetter, as I remember we had about 20 different fonts, and a few like Helvetica, we had different faces, bold, Italic, etc.