The electrical equipment market of the Netherland East Indies

John Pierpont Morgan, der Weltbankier

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Monograph

Identifikator:: 1833098390

URN:: urn:nbn:de:zbw-retromon-221838

Document type:: Monograph

Title:: The electrical equipment market of the Netherland East Indies

Place of publication:: Washington

Publisher:: Gov. Pr. Off.

Year of publication:: 1930

Scope:: II, 46 S.

Digitisation:: 2022

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Batteries and appliances

Collection:: Economics Books

[0 ECONOMIC GEOLOGY some are saddle-shaped in cross-section. When alternate beds of slate and quartzite are bent into parallel anticlines and synclines, lens-shaped spaces are apt to occur along the top and bottom of the folds. The spaces taper out on the sides, as the beds are there forced together by the lateral pressure which caused the folding. Percolating water will deposit material in the spaces and thus form lodes which are thickest at the crown or cap of the arch, and thin out on sach side (Fig. 5). These formations are saddle-lodes and are best known in Bendigo, Victoria. . The crown in those at the surface had been destroyed by denudation leaving two sheets of quartz dipping in opposite directions. As these sheets thinned out at a slight depth it was feared that the F16. 6.—A FALSE SappLz, A false saddle-lode due to spurs along the bedding planes from a main vein. The line AC of the assumed “centre country ” would lead away from the ore veins. mines would be shallow, as search for isolated patches of quartz would be too costly. The regular distribution of ‘hese bodies on the arches of the anticlines was proved during the survey of the field by the Geological Survey of Victoria, and as similar arches of quartz were found one below another along the anticlinal axes, mining was carried to the depth of 4,500 feet. Bendigo, instead of being merely a superficial field, included for a time the deepest gold mines in the world. Lodes are also found on the floors of synclines ; but these “inverted saddles” are less rich in gold than the anticlines, though they have been profitable, as at Wedder- burn. As saddle-lodes occur one below another it is important fo distinguish between true saddle formations and ** falgse- A

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