6. Log Drivers
While we're familiar with seeing large trucks carrying logs on the road, I bet you've never seen how they used to do it! As you see in the photo from 1917 above, men would essentially "ride" the logs down rivers to a processing plant.
7. Aircraft Listeners
Before radar technology had been developed, the military would use very odd-looking machines like the one above in order to try to detect enemy aircraft. They typically employed younger men who already had strong hearing skills.