The History of Tourism in Ancient Greece and Rome.

Tourism in Ancient Greece and Rome: Historic Evolution of Tourism This is the first part of an investigation of the History of Tourism. The second part, Tourism in the Middle Ages can be read here Tourism is a series of trips made for pleasure or for commercial, professional or similar reasons, during which the absence of habitual residence is only temporary. Triumph Arch in Via Agrippa – Orange – (France) Modern tourism was born in the XIX century, as a …

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Evolution of a Crane and Hoist in Ancient Rome

Evolution of a Crane and Hoist in Ancient Rome  The Roman Empire invested a lot of time, effort and money developing new cranes for the construction of their buildings, bridges and especially aqueducts. They took the Greek’s crane as a model and improved it. Tripastos in Ancient Roman Empire In fact, the simplest Roman crane was the Tripastos. It consisted of a single beam jib, a lathe, a rope, and a block containing three pulleys. By maintaining a multiplication ratio of 3 to …

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History of Power Bank

History of Power Banks and Lithium batteries When was the first call of a mobile phone? Martin Cooper, manager of Motorola, made a call to, Joel Engel, of Bell Labs of AT&TE on April 3, 1973, from Sixth Avenue in New York, with a prototype of Motorola DynaTac 8000X. That was a mobile phone that weighed approximately one kilo and was about 13 inches (33 cm) tall taking into account the antenna. It was the first call made from a …

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Gdansk Harbor Treadwheel Crane

Gdansk Harbor Treadwheel Crane – Poland Treadwheel Crane: They were the largest cranes in Medieval Europe . Their usual operation for wheel cranes were with two squirrel cages and for two or more operators. Originally from the 15th century, it was built between 1441 and 1444. Today it is one of the most representative emblems of the city of Gdansk. The crane building in Gdansk was built in the Gothic style with steep roofs. The central tower is 31 meters …

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