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Gilbert cloud chamber, assembled An alternative view of kit contents. The lab contained a cloud chamber allowing the viewer to watch alpha particles traveling at 12,000 miles per second (19,000,000 m/s), a spinthariscope showing the results of radioactive disintegration on a fluorescent screen, and an electroscope measuring the radioactivity of different substances in the set.
First known as the Mysto Manufacturing Company, the company was founded in 1909 in Westville, Connecticut, by Alfred Carlton Gilbert, a magician, and his friend John Petrie, to provide supplies for magic shows. [2] [3] Their "Mysto Magic" magician's sets were marketed from the 1910s until the 1950s. The sets contained a variety of objects ...
In 2017, the Smithsonian Institution interviewed African Americans and recorded the ring shout tradition practiced by the Gullah Geechee in Georgia. The songs sung during the ring shout and in shouting originated among their ancestors who were transported from Africa into slavery in America, where they replaced African songs and chants with ...
The elder Leighton became the company chemist. In 1864 he developed an improved formula for soda–lime glass that could be pressed and did not require lead—but produced glass with almost the same quality as crystal. [66] The raw materials for this type of glass cost much less than crystal made with lead, and the soda–lime glass hardened ...
Candle moulding machine in Indonesia circa 1920. Candle making was developed independently in a number of countries around the world. [1]Candles were primarily made from tallow and beeswax in Europe from the Roman period until the modern era, when spermaceti (from sperm whales) was used in the 18th and 19th centuries, [2] and purified animal fats and paraffin wax since the 19th century. [1]
In a new court filing, federal prosecutors allege the suspect who took a hostage and got into a shootout with Yellowstone National Park rangers in July ranted that he "refuse[s] to fraternize with ...
With Christmas Day just around the corner, see photos of dogs from around the world in the holiday spirit.
Kiln-Cast lead crystal Kiln casting involves the preparation of a mould which is often made of a mixture of plaster and refractory materials such as silica. [ 7 ] A model can be made from any solid material, such as wax, [ 8 ] wood, or metal, and after taking a cast of the model (a process called investment) the model is removed from the mould.
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