03-08-2023, 11:58 AM
(This post was last modified: 03-08-2023, 11:58 AM by Mike Watterson.)
Nylon on sale in 1938.
Flexible PVC maybe in 1933. Some WWII military gear has both original PVC and rubber insulated wiring.
Vinyl microgroove 12″ 33 rpm in 1948 (various 78s with bigger grooves did exist in 1930s at 12″ and larger, and even 33rpm played from centre)
Vinyl microgroove 7″ 45 rpm in 1949, originally only with big hole for RCA autochanger. Hence spiders are as old as 45s
So nylon gears might predate 45 rpm jukeboxes by 10 years or more.
Bakelite and Rayon/Viscose are maybe two of the oldest commercial plastics. Bakelite though replaced in maybe 1960s by the current material of domestic electrical fittings which is very similar.
Flexible PVC maybe in 1933. Some WWII military gear has both original PVC and rubber insulated wiring.
Vinyl microgroove 12″ 33 rpm in 1948 (various 78s with bigger grooves did exist in 1930s at 12″ and larger, and even 33rpm played from centre)
Vinyl microgroove 7″ 45 rpm in 1949, originally only with big hole for RCA autochanger. Hence spiders are as old as 45s
So nylon gears might predate 45 rpm jukeboxes by 10 years or more.
Bakelite and Rayon/Viscose are maybe two of the oldest commercial plastics. Bakelite though replaced in maybe 1960s by the current material of domestic electrical fittings which is very similar.
