Thank you all for you very warm welcome.
Filmtechnik, Thank you for your very kind and generous comments about my German. I read and understand German much better than I speak it. My wife is half German and we visit Germany at least once a year - always for the Christmas markets and frequently during the summer. In fact, we have only just returned from Nuremberg.
Martin. Yes, it is a Vitaphone attachment. At present it does not work, as I am using a 1950s replacement motor, which runs at a different speed from the original motor. I have an original motor from 1929, but the wiring is fragile and it need a lot of work. The disc is from the 1929 film "Redskins",
FP. Thank you very muchfor the details of the Federal Archive. I will contact them in the new year.
Sam. Thank you so much for the very interesting links to two of the films. And, yes, the pictures are on the Filmtech site.
TK-Chris. Thank you for the summary of "FP1 antwortet nicht". You certainly know your projectors! One is a Western Electric Universal Base sound reproducer (1930) with a Kalee 12 mech (1941 type) and Monarc lamp. The other is a Ross GC1 mech (1947) with an RCA9031 soundhead (1947) and a Peerless Magnarc lamp (1930s). The Universal Base/Kalee12/Monarc came from the local cinema, where I spent many happy hours in the 1950s. The Ross GC1/RCA9031/Magnarc came from my wife's old local cinema, where she also spent many happy hours in the 1950s.
May I wish you all a great Christmas and a very