Annual report of the City Engineer . free from electrolytic actionof any sort. The above distinctions between the positive and negative electrodes,while not clearly delinod in all cases, were suHicientl3nnarkc(l to enableus to determine pretty definitely Avhether or not a pipe was subjected toelectrolytic action, if inspection were made immediately after the pipewas removed from the ground. Iron Pipes. In the case of the iron pipes, the indications were less marked. Tliepipes were originally covered with a fine incrustation of sand, theparticles of which were very firmly cemented together. A\h
Annual report of the City Engineer . free from electrolytic actionof any sort. The above distinctions between the positive and negative electrodes,while not clearly delinod in all cases, were suHicientl3nnarkc(l to enableus to determine pretty definitely Avhether or not a pipe was subjected toelectrolytic action, if inspection were made immediately after the pipewas removed from the ground. Iron Pipes. In the case of the iron pipes, the indications were less marked. Tliepipes were originally covered with a fine incrustation of sand, theparticles of which were very firmly cemented together. A\hen the pipeswere insjjected after a few days run, the only tiling observed was thatthe scale ci-acked oil more easih where electrolytic action had takenplace than wliere no action wliatever was jiresent; but there was noclearly defined diflerence between the negative and positive pipes, and T Scale ]A]. ^i^:^ • KriKVC^Xi PLATE VI 1 . m I )> c 3 S .Tar;: . /? ^-^J Stone &Webster
Size: 3446px × 725px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1800, bookdecade1860, booksubjectpublicworks
