Spiral

Building spiral turbines c. 1930

Retronaut | Source: German Federal Archive

Bath Chair

"The Bath chair is a forerunner to the modern wheelchair. It was invented by James Heath and gained popularity and its name when used by visitors to the spa town of Bath from the 1700s. Many visitors who came to ‘take the waters’ were often in poor health. Although the occupant can guide the direction of the chair, an attendant pushes it from behind to provide the power. Sedan chairs had been the most popular transport for individuals. They were carried by two or more people. However, the more convenient Bath chair had taken its place by 1830. Wheeled chairs had been used before in England, but the Bath chair’s popularity made it the vehicle of choice."

sciencemuseum 

Object number:
1979-811 Pt3

Giant Listening Device

by x-ray delta one

flickr | shorpy