Screw – Simple machines – Physics
A cider press with big wooden screws What is a screw? People always count screws as a separate kind of simple machine. But really screws are just one kind of inclined plane. [...]
A cider press with big wooden screws What is a screw? People always count screws as a separate kind of simple machine. But really screws are just one kind of inclined plane. [...]
Ionic order: the parts of an Ionic temple A new way to build temples Around 500 BC, Greek architectural styles changed so that instead of building temples in the old [...]
An early playing card (Ming Dynasty, ca. 1500 AD) People in T'ang Dynasty China made the first playing cards, about 800 AD. They used their new material, paper, to make [...]
History of knitting: Nalbinding hat from Urumchi (ca. 1000 BC) Nalbinding and sprang Even before the invention of spinning and weaving, people were making cloth using early forms of knitting [...]
A camel caravan in northern China Long ago, in the Stone Age, about 3000 BC, many different kinds of wild animals lived in China - elephants, lions, pandas, wild horses, [...]
A Samnite man cutting the bronze pins off a newly poured lost wax statue. This is the only ancient image of lost wax casting; it's from Pompeii, about 400 BC. [...]