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Herschel's 40-foot-telescope, constructed between 1785 and 1789.

Image taken from page 120 of ‘L’Espace céleste et la nature tropicale, description physique de l’univers … préface de M. Babinet, dessins de Yan’ Dargent’

Title: “L’Espace céleste et la nature tropicale, description physique de l’univers … préface de M. Babinet, dessins de Yan’ Dargent”

Author: Liais, Emmanuel

Contributor: BABINET, Jacques.

Contributor: DARGENT, Jean Édouard – calling himself Yan’ Dargent

Shelfmark: “British Library HMNTS 10003.d.10.”

Page: 120

Place of Publishing: Paris

Date of Publishing: 1866
40-foot telescope
https://en.wikipedia.org/wiki/40-foot_telescope