antik.it/Antique-astronomical-instruments/5179-Astronomical-telescope/
1512483293Code 5179 Astronomical telescopeAstronomical telescope, brass, focusing with one extension with rack and view finder, with rack tripod made of mahogany and original oak wooden box, with key and brass hinges. Signed A. Franks Optician Manchester, mid-XIX century. Very good condition and perfectly working, Height of rack cm 142 - inches 55.9, maximum height cm 180 - inches 70.8, length of telescope cm 153 - inches 60.2, focal diameter cm 8 - inches 3.14. Measures of box cm 117x23x17 (h) - inches 46x9x6.69 (h).
Among the Jewish arrivals who joined the instrument trade in Manchester at the beginning of the XIX century, was the Franks family coming from Netherlands, who became opticians. Isaac Franks stared his business in Manchester in 1808 and his son Jacob obtained shop premises in the Oldham Road from 1819. He was in business with his son Abraham, in whose name the firm continued from 1848 with Abraham’s half-brother Joseph.
Galilei never said that telescope was his own invention, but Della Porta, feeling defrauded of this invention, in a letter to Federico Cesi wrote that telescope was a stupid and simple thing and he had just spoken about it in his work De Refractione. But when Galilei showed the telescope to some senators of the Venice Republic the surprise was enormous, but it was small the reward for Galilei: the Republic didn’t buy this telescope because some councillors said that some similar instruments were just sold with lower prices; Galilei obtained simply an increase in salary and the confirmation as teacher in Padua where he taught mathematics.
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Antique astronomical instruments
Code 5179 Astronomical telescope
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