This multiple tape recorder removes the last obstacle to commercial recordings on magnetic tape -- the mass production of duplicate tapes. It makes eight duplicates at once at three times normal speed. It can also record two sound tracks on the same tape at the same time. Thus the machine can turn out eight hour-long recordings in 10 minutes, or 48 an hour.
Signals from a master tape are amplified and then fed into recording heads, shown above. A common capstan keeps the master and copy tapes at the same speed. In playback, one side of the double sound track plays as the tape reel unwinds, the other as it winds up. Minnesota Mining and Mfg. Co. made it.
Stay up to date on the latest news of the future of science and technology from your iPhone with full articles, images and offline viewing
Featuring every article from the magazine and website, plus links from around the Web. Also see our PopSci DIY feed
Share links with friends, comment on stories and more
In our December issue, Popular Science names the 100 best innovations of the year: bombproof wallpaper, self-parking cars, the fastest helicopter, and 97 more. Plus inventor profiles and videos.
Check out the best of what's new here.

I think this is going to be BIG! someday we may even be able to listen to magnetic tapes in our automobiles :)
technology these days....
from coral gables, fl
Funny
from coral gables, fl
Funny
Why would anyone want music like this where you can put it on a 'tape'? What's wrong with the radio........You can get BOTH kinds of music from the radio - Country AND Western....
This is foolishness !!!
from Quito, Pichincha
The music industry will be doomed and backrupt within 5 years I will tell ya!!
Nobody will go to any of the classic concerts anymore.
Ries