Reel-to-reel tape recorder.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...y_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...er_cutaway.jpg
Previously:
https://www.homemadetools.net/forum/...209#post130545
https://www.homemadetools.net/forum/...147#post130325
https://www.homemadetools.net/forum/...058#post129953
https://www.homemadetools.net/forum/...057#post129949
