A 41in telescope lens now being constructed at Newcastle for , a Siberian observatory is not the "world's biggest," though it is, perhaps, the biggest used in any refraction telescope. It is a pigmy, however, beside the 10(Hn lens of toe Mount Wilson reflecting telescope, which is by no means the biggest possible. This lens weighs four tons, and a special motor road had to be constructed np Mount Wilson for it. It took 10 years to grind and polish, the process being completed by a long course of rubbing with silk handkerchiefs. The lens was first cast at the close of the iast century, but after many years' work had been done on it. it was found to have a flaw in it, and the work had to be repeated. RADIO NEWS. For regular loud speaker reception of Australian Stations, an Asco Roberts 4 is unexcelled. Get our quotation. AMATEURS' SUPPLY COY. 810 Colombo street, North.
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Press, Volume LXI, Issue 18551, 28 November 1925, Page 10
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156Page 10 Advertisements Column 2 Press, Volume LXI, Issue 18551, 28 November 1925, Page 10
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