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XVIII. Description of a forty-feet reflecting telescope

1795/12/31 by William Herschel · 1 citation
Engineering · Arts and Humanities · Psychology · #Mechanics and Biomechanics Studies #Historical Studies in Science #Telescope #Compass #Habit #Computer science #Astronomy #Physics #Psychology

paper · doi:10.1098/rstl.1795.0021

openalex publication_date 1795/12/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/05/21

Abstract

The uncommon size of my forty-feet reflecting telescope will render a description of it not unacceptable to lovers of astronomy. I shall therefore endeavour to give as complete an idea of its construction as the limited compass of this paper will permit, and hope that, with the assistance of the annexed drawings, the mechanism of it will be sufficiently intelligible to such as have been in the habit of viewing machines and mechanical works. It will be necessary to mention a few circumstances that led the way to the construction of this large instrument, in the execution of which two very material requisites were ne­cessary: namely, the support of a very considerable expence, and a competent experience and practice in mechanical and optical operations.

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