The Elements of economic geology

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Monograph

Identifikator:: 1773832379

URN:: urn:nbn:de:zbw-retromon-172798

Document type:: Monograph

Author:: Gregory, John W. http://d-nb.info/gnd/11683014X

Title:: The Elements of economic geology

Place of publication:: London

Publisher:: Methuen

Year of publication:: 1928

Scope:: XIV, 312 S.; graph. Darst.

Digitisation:: 2021

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Part III. Earthy minerals

Collection:: Economics Books

CHAPTER XIV BUILDING STONES AND ROAD METALS I. BuiLping StoNEg! BuiLpiNnG stone may appear so durable that it might be expected to last for ever; yet some stone buildings decay with deplorable rapidity. The outer stone of most of West- minster Abbey is said to have been replaced five times. The British House of Parliament, built in 1840-50 of stone recommended by a Royal Commission whose report (1830) was for long the standard text-book on British building stones, has crumbled so fast that its ornament has been partly replaced by cast-iron, and the Members of Parliament were warned in 1925 not to stand within 3 feet of the walls to avoid falling fragments. The quickness with which stones decay may be realized in any old churchyard, for it is rare to find an intelligible inscription on a tombstone more than 200 years old, unless it has been recut. Poor stone is less durable than good timber. Most of the buildings that have lasted six or seven centuries are churches, which were built by religious fraternities who would have regarded the use of inferior material as sacrilege. Cavuszs oF DEcay—The decay of building stone is primarily due to the entrance of water, which weakens or dissolves the cement and introduces material that, on solidification, dis- integrates the stone. The early builders therefore designed projecting dripstones, string-courses, and gargoyles to throw the rainwater off the building. The injurious effect of moisture is often shown by the decay of the under surface of projecting stone, and in the lower part of a wall which lds ; he testing J. A. Howe, The Geology of Building Stones, 1910; for t : of La 7. Hirschwald, il bautochnischen Gesteinsprifing, Berlin, 1912,

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