Abstract

During the last summer I had the honour of submitting to this Society a short paper on the subject of the large zenith telescope lately erected at this Observatory. It is now nearly twenty years since the erection of such an instrument was first suggested to the President and Council of this Society; at that time the Royal Ob­servatory was in a very inefficient state compared to what it is at present. We had only one circle; and there existed doubts as to the excellence of this instrument, though not any were ever entertained by me. The erection of a second circle put this question at rest; it has been abundantly shown in various volumes of the Greenwich Observations, by a series of more rigorous investigations than any instrument was ever submitted to before, that both the circles may be considered as perfect, their errors being less than their respective makers themselves assigned.

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