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Purification of the Washington Water Supply (Classic Reprint)
No preview available - 2015
acre per diem alum alumina amount average bacillus bacteria per cubic bacterial efficiency bacteriological cement cent chemical Cincinnati city of Washington clay coagulant Colonel Miller committee contained contractor cost cubic centimeter death rate December 27 District of Columbia Diven effluent engineer officer English filter estimate experiments feet filter beds filter plant filtered water Fuller furnish gallons per acre germs Hazen hygienic inches increase influent investigation layer loss of head mechanical filter mechanical filtration mechanical system medical society Moore necessary number of bacteria number of deaths obtained officer in charge operation period pipe Potomac River Potomac water pressure filters Professor Mason quantity rate of filtration raw water reduced removed River water sand bed sanitary satisfactory scraping sedimentation slow sand filter slow sand filtration surface suspended matter system of filtration tion turbid waters turbidity typhoid fever washing Washington Aqueduct water purification Weston Woodward
Page 272 - The cement shall be considered to have acquired its initial set when the pat will bear, without appreciable indentation, the Gillmore Mm I needle ^ in.
Page 151 - California, and of the 12th section of the Act of Congress approved on the 31st of August, 1852, entitled An Act making appropriations for the Civil and Diplomatic expenses of the Government for the year ending the thirtieth of June, eighteen hundred and fifty-three and for other purposes...
Page 239 - Bidders or their authorized agents are expected to examine the maps and drawings in this office, which are open to their inspection, to visit the locality of the work, and to make their own estimates of the facilities and difficulties attending the execution of the proposed contract, including local conditions, uncertainty of weather, and all other contingencies.
Page 273 - ... per cent of water by weight. After being thoroughly mixed and worked for five minutes, the cement or mortar will be placed in the briquette mold in four equal layers...
Page 276 - ... so accepted and the amount for which the proper officer of the united States may contract with another party to furnish said articles and services, if the latter amount be in excess of the former.
Page 273 - A cement may be rejected in case it fails to meet any of the above requirements. An agent of the contractor may be present at the making of the tests, or, in case of the failure of any of them, they may be repeated in his presence.
Page 238 - If a bidder wishes to withdraw his proposal he may do so before the time fixed for the opening without prejudice to himself by communicating his purpose in writing to the officer who holds it, and, when reached, it shall be handed to him or his authorized agent unread.
Page 238 - A proposal by a person who affixes to his signature the word " president," "secretary," "agent," or other designation, without disclosing his principal, is the proposal of the individual. Proposals by a corporation should be signed with the name of the corporation, followed by the signature of the president, secretary, or other person authorized to bind it in the matter, who should file evidence of his authority to do so.
Page 273 - ... presence. If the contractor so desires, the engineer officer in charge may, if he deem it to the interest of the United States, have any or all of the tests made or repeated at some recognized standard testing laboratory in the manner herein specified.