What Old Futures Can Tell Us About Worldbuilding

I was taking a look at Stand by for Mars!, the first of the classic 1950s Tom Corbett Space Cadet Adventures, and this passage stood out like a sore thumb:
Speaking into an audioscriber, a machine that transmitted his spoken words into typescript, he repeated the names of the candidates as they passed.
And later
…he picked up the audioscriber microphone and recorded a brief message. Removing the threadlike tape from the machine, he returned to the house and left it on the spool
Bit of background. It’s the year AD whatever. In the first excerpt, somebody is recording the arrival of candidates for the Space Academy. In the second excerpt… actually I have no idea what’s happening. I bounced halfway through the first chapter, not because of the retro future, but because I didn’t much care for standard issue school stories where the personality clashes weren’t tied to wider issues and themes — JKR did it better. However, it’s the retro future I’m interested in here.
Let’s think about the audioscriber.