Wright Brothers National Memorial propelled himself into the air while wearing paddles on his arms and legs; An homage to Otto Lilienthal, a German who died while conducting gliding experiments; A reference to a French philosopher who thought that since dew rose in the morning, if it could be placed in an expandable bag attached to a box and sail, it would naturally rise when placed in the sun. (It didn't.) Right Door (top to bottom): Icarus, the Greek mythological figure who tried to fly from Crete by attaching feathers to his arms with wax. He fell when he flew too close to the
Technological and industrial history of the United States only be made once, silversmiths generally used lost-wax casting, in which a sculpted object was carved out of wax, an investment casting was made, and the wax was melted away. The molds produced in this manner could only be used once, which made them inconvenient for standard objects like handles and buckles. Permanent mold casting, an industrial casting technique focused on high-volume production, allowed smiths to reuse molds to make exact replicas of the most commonly used items they sold. In creating these molds and developing standardized manufacturing processes, silversmiths could begin delegating some work to apprentices and journeymen. For