Transactions and proceedings of the New Zealand Institute (1913) (14769533805)

Identifier: transactionsproc46newz (find matches)
Title: Transactions and proceedings of the New Zealand Institute
Year: 1913 (1910s)
Authors: New Zealand Institute
Subjects: Science
Publisher: Wellington : J. Hughes, Printer
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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ugh O we have — a cos2A + b cos2B -f c cos2C = ^ (s - a)whence — sin 3A + sin 3B + sin 3C = o 3A . 3B • 30 i.e., cos— sin— sin— = o, 2 2 2 and therefore either A is 60° or B or C is 120°. Art. XLIX.^—An Ancient Maori Stone-quarry. By H. D. Skinner. (Read before the Otago Institute, 17th March, 1910.) Plate XII. About nine miles from the Town of Nelson, on the old Maungatapu Trackthat leads from the Maitai Forks into the valley of tbe Pelorus, is a well-known Maori tool-manufactory or quarry. The present road from Nelsonfollows the Maitai Valley to the Forks, where the old track strikes offup the spur between the north and the south branch. (See map.) Onthe spur, about a mile from the Forks, tbe track passes over a smallhummock, beyond which there lies a curious hollow in the ridge. Thisbasin encloses a shallow pool of water surrounded by a belt of rushes,from which the place takes its modern name—the Rush Pool. The shores, Skinner.—^ Ancient Maori Stone-quarry. 325
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326 Transactions. which, though low, rise steeply from the pool on three sides, are coveredwith stunted trees, manuka predominating. The north-eastern shore inone part rises barely a foot above the water, and then slopes down into agully, a continuation of the hollow in which the pool lies. The existenceof a pool in so unlikely a place—half-way up the summit-line of a steepspur—is due to a low causeway crossing the bed of a shallow gully. Thehead of the gully thus cut off forms the basin of the pool. From the northand south rims of the basin the sides of the spur fall steeply away tostreams some hundreds of feet below. On the north-west side, behind theobserver, the summit-line of the spur falls away, steep, rocky, and bare, tothe Forks, about a mile distant. Eastward across the hollow the summit-line of the spur rises steeply to the main ridge, which forms the sky-line,more than a mile away. The spurs northward-facing slope is mineralcountry, stony and barren, but the southern sl

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