Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 860
gnation just de- 838 AMERICAN TELEPHONE PRACTICE. scribed, that this trouble has been entirely eliminated. The life ofcreosoted wood conduit is, to say the least, problematical, but thereseems to be good reason to believe that when properly treated andlaid it will last an ordinary lifetime, if not… … FIG. 616.-SINGLE AND MULTIPLE-DUCT CONDUIT. from one man-hole to the other, a creosoted wood plank two inchesthick is laid as a foundation. The ducts are then laid on this plankside by side and in as many different layers as are necessary to givethe required number. They should be sojaid that the…
Telephone
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