File:A manual of practical hygiene for students, physicians, and health officers (1911) (14596095560).jpg

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Identifier: manualofpractica1911harr (find matches)
Title: A manual of practical hygiene for students, physicians, and health officers
Year: 1911 (1910s)
Authors: Harrington, Charles, 1856-1908 Richardson, Mark Wyman, 1867-1947
Subjects: Hygiene
Publisher: Philadelphia, Lea & Febiger
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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introduced, andthen the soil is added a little at a time, and made as compact as pos-sible by striking the lower end of the cylinder downward with reason-able force against the table. When the desired length of column hasbeen reached, the disk E is introduced, between which and the inletend (G) an air space of sufficient size is left to insure uniform pressure EXAMINATION OF SOILS. 357 ;i^;iiiisl, <Jio cnfin- siirf;u;c oC flic disk. V\\v. iiil<;l, ((id in <-l(tsff! \ty(iKtiuis <»r :i tij^lilly (Kliii^ iiihltci- ,sl;>;»<r having two ;icr-(orali()(is, <»n«;of wliicli (i!irri(!H tlic iiilcl liihc (Vom llic ji;:iH-rnctcr, ami fli<; olhfr theinaiioniclcr in<li(%i,l,iii^ (lie prcssiiic <iii;tloyc(l. Tlic prcssiin^ is ohlaincd by (ii(;a,iis ol a (miIiimiii dC water foiniiiiiiii-caiiiijji; vvilli llic cliainlxT of ilic f^as-lioldcr, \vlii«li is cDiinccl**! hy arublu!!- tube vvilli tlic iiilct of tli(; nic.ti-r; and it is regulated by u wrew Fkj. 2;(.
Text Appearing After Image:
Apparatus for determination of permeability of soil to air. pinclicock on the outlet tube of the latter. The foree is apjilied. thereading: of the meter is noted, and at the expiration of the unit of time,one, five, or whatever number of minutes it may be, the reading of themeter is taken again. Permeability to Water.—The permeability of a soil to water isexpressed in terms indicating the auKnint of water which will passfrom above downward through a column of saturated soil durinor anv 358 THE SOIL. given unit of time under a given pressure. The apparatus for thisdetermination, shown in Fig. 24, consists of a metallic cylinder (tI)with a perforated or gauze bottom on which the sample of soil is packedclosely, and another cylinder (/>), likewise of metal, provided with anumber of outlet tubes (c), at regular intervals, preferably of 5 or10 cm. The lower end of B fits tightly into the up)ier end of ^t, andthe joint is made impervious to water by means of adhesive plaster,sealing-wa

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  • bookid:manualofpractica1911harr
  • bookyear:1911
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Harrington__Charles__1856_1908
  • bookauthor:Richardson__Mark_Wyman__1867_1947
  • booksubject:Hygiene
  • bookpublisher:Philadelphia__Lea___Febiger
  • bookcontributor:Columbia_University_Libraries
  • booksponsor:Open_Knowledge_Commons
  • bookleafnumber:382
  • bookcollection:medicalheritagelibrary
  • bookcollection:ColumbiaUniversityLibraries
  • bookcollection:americana
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30 July 2014
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