Modern Mechanix Round-UP

Today on Modern Mechanix we look at this revolving tooth brush from 1938 which looks a lot like an Oral-b with one critical difference: It’s spring powered. This Popular Science from 1931 explains all of the techniques engineers used to win our “Endless Fight for Water“. Also check out this acoustically guided missile, a thirty-foot periscope for golfers, a method to keep a cop’s feet warm and a crazy Charles Atlas ad.

1. [noen]

   So the revolving toothbrush is cordless! Nothing ever changes does it?