File:Collier's new encyclopedia - a loose-leaf and self-revising reference work with 515 illustrations and ninety-six maps (1921) (14761213196).jpg

Identifier: colliersnewencyc01newy (find matches)
Title: Collier's new encyclopedia : a loose-leaf and self-revising reference work ... with 515 illustrations and ninety-six maps
Year: 1921 (1920s)
Authors:
Subjects: Encyclopedias and dictionaries
Publisher: New York : P. F. Collier
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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he plate, and causing this to adhere byheat, the design being previously etched,or being now traced out. The nitric acid(aqua fortis) acts only in the intersticesbetween the particles of resin or mastic,thus giving a slightly granular appear-ance. AQUEDUCT, an artificial channel orconduit for the conveyance of water fromone place to another; more particularlyapplied to structures for conveying waterfrom distant sources for the supply oflarge cities. Works for supplying com-munities with water must have been con-structed at a very early period. InChina there are said to be aqueductsdating back to prehistoric times. InPersia and Assyria there are structures AQUEDUCT 216 AQUEDUCT th£ remains of which indicate that they it furnished 277,866 cubic meters a day; were used for aqueducts. Recent ex- it was not used for drinking, but for cavations at Jerusalem have laid bare irrigating gardens and flushing drains. wells and channels cut in the solid rock, In 144 B. c. the Senate determined to
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comparative: sectionsof aqueducts CATSKILL

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