Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 371
OPTICAL INSTRUMENTS. 367 The largest telescope ever constructed is that made by Lord Rosso. Thisinstrumeiit, which is a rellecting telescope, is located at Parsonstown, inIreland. Its external appearance and method of mounting is represented inFig. 305. The diameter of tlie speculum is 6 feet, and…
Physics · Science · Technology
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