File:Scottish geographical magazine (1885) (14803954593).jpg

Identifier: scottishgeograph20scotuoft (find matches)
Title: Scottish geographical magazine
Year: 1885 (1880s)
Authors: Scottish Geographical Society Royal Scottish Geographical Society
Subjects: Geography
Publisher: Edinburgh, Royal Scottish Geographical Society
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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amount of water draining into the loch during the wetsummer of 1903. The highest surface temperature recorded was oneof 59-2° on June 30, 1902, off Bracora, the air-temperature at the timebeing 62*8°, with a moderate westerly breeze. This gives a total rangeof 17*4° between the highest surface and the lowest bottom temperaturerecorded. 1 The figures referring to these continental lakes are derived from Halbfass, DieMorphometrie der Europaischen Seen, Zeitschr. Gesellsch. Erdk. Berlin. Jahrg. 1903,p. 592 ; 1904, p. 204. BATHYMETRICAL SURVEY OF FRESH-WATER LOCHS OF SCOTLAND. 457 The deposits covering the floor of Loch Morar are mostly dark brownin colour, which becomes almost black in the deeper parts. A samplefrom 1000 feet was dark brown when wet, and greyish-black when dry,containing about fifty per cent, of black vegetable matter, about ten percent, of mineral particles (quartz, mica, hornblende, etc.), with a meandiameter of 015 millimetre, and about forty per cent, of amorphous
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PIG. 0.—FALLS OF MORAR.(Photo by T. N. Juhnson.) clayey matter, with many fine Diatoms and a few fragments of arena-ceous Foraminifera. The mica is present in extremely minute flakes,and imperceptible to the naked eye in the unwashed material. In thisrespect the material from Loch Morar differs from that obtained in mostof the other lochs, in the samples from which the glistening mica flakesattract ones attention. Loch Beoraid (see Map).—Loch Beoraid is a long narrow loch, lyingamidst wild and rocky scenery about three miles to the south of LochMorar. There were no Ordnance Survey bench-marks available in thevicinity of the loch from which the level of the water surface could beascertained, but from the position of the spot-levels, the height wasestimated at 168 feet above the sea. The loch trends in an east-to-westdirection, and is fed by numerous small burns, the largest, Allt a GhlinneDhuinn, flowing in at the east end. The Meoble river, which drainsthe loch, issues at the west

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