Specifically, I'm looking for the font used for the words "COLOR CODE". It looks to be Clarendon, which is used throughout the manual, but I haven't been able to find a specimen with the wide, flattened "O". Additional pictures of the Buckminster Fuller manual can be found on Stephen Coles' Flickr here.
Reminds me of Volta, but that wasn’t released until 1956.
These headlines could be hand lettered, but it’s also possible that it’s one of the many phototype versions of Clarendon. Photo-Lettering, for example, offered at least two families — Clarendona and Continental Clarendon — that had very extended styles, and the latter is a pretty good match. The headlines could also be scaled after setting, though phototype manipulation was not that common in the 1950s. That said, this booklet doesn’t show a publish date. I only assumed it was around 1956 given the style and the year of the patent mentioned in the introduction.
