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With any topic in a large forum there are bound to be people who are knowledgeable. With regard to old records in this forum, that would be me.
What we call 78s did not have a standardized speed before roughly 1929. Before then the speeds varied by manufacturer and could range between 72 minus and 80 plus. They were pressed using a compound containing shellac (not wax) and indeed were and are very brittle. Vinyl replaced shellac when 45s and LPs came along starting in the late 1940s.
Wax was the medium for early Edison cylinders. Some Edison cylinder players also could record on blank wax cylinders. It was common, especially in the 1950s and 1960s, for records to be nicknamed wax (e.g., lets put that on wax) or for the word to be used as a verb (e.g., let's wax a record), but actual wax for recordings went away with the cylinders.
It was possible for disc recordings to be made on fixed or portable record cutters (such as the blank label record in the story). Before wire or tape recorders became available, this was the primary way personal recordings or demo recordings were made. The blank discs were made of aluminum or glass and coated with a layer of lacquer or rarely acetate. The lacquer was the medium in which the cutter made the groove with the sound.
Probably more than you wanted to know, but when a record collector reads a story about records, well... you know...