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 Transit Circle at Cambridge Observatory, U.S.

XVI. THE OBSERVATORY.

have endeavoured to give our readers an idea of the principle, construction, and function of the telescope; but before passing from the subject, we cannot but advert to the remarkable circumstance, that the chief improvements are due to the labours of men busily engaged in trades and professions, which might at first sight seem incompatible with scientific pursuits. We have already instanced the case of Sir