Technology and the Growth of Civilization by Giancarlo Genta & Paolo Riberi

Author:Giancarlo Genta & Paolo Riberi
Language: eng
Format: epub
ISBN: 9783030255831
Publisher: Springer International Publishing

Spectacles . Apart from questionable, or at least exceptional precedents, in particular the emerald that Nero used to watch circus shows, spectacles were introduced in the fourteenth century, having probably been invented by a friar from a Venetian convent. At the beginning they were rare and expensive, but towards the end of the fifteenth century they became sufficiently widespread to begin to have a significant economic impact. In fact, they extended the working life of all those whose jobs required good visual ability, who would otherwise have had to stop working at around 40−50 years old, the age at which the presbyopia (long-sightedness) tended to manifest.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.