. Electrical world. o Beirut, where quite a few have been sold during the past is believed that electric street railways will be authorized by theCentral Government before long, along with electric light, tele-phones, etc. March 19. 1904. ELECTRICAL WORLD and ENGINEER. S6i Standardizing of Subway Manhole Construction. By Hugh C. Baker, Jr. ENGINEERS who have had experience in the construction ofsubways for telephone or electric light cables, especially insuburban districts, will readily appreciate the value of a sys-tem of manhole coiistructiun whereby all manholes can be built ex-actl
. Electrical world. o Beirut, where quite a few have been sold during the past is believed that electric street railways will be authorized by theCentral Government before long, along with electric light, tele-phones, etc. March 19. 1904. ELECTRICAL WORLD and ENGINEER. S6i Standardizing of Subway Manhole Construction. By Hugh C. Baker, Jr. ENGINEERS who have had experience in the construction ofsubways for telephone or electric light cables, especially insuburban districts, will readily appreciate the value of a sys-tem of manhole coiistructiun whereby all manholes can be built ex-actly the same in size and shape, with interchangeable concrete walland top blocks which are placed together by ordinary laborers prac-tically without supervision. Such a system has now been designed and patented, and was usedlast year experimentally by the New York Telephone Company. In Fig. I is shown a sectional elevation of a concrete block man-hole which In believed to have points of sufficient merit to make it DDO. FIO. I.—SECTIONAL ELEVATION OF MANHOLE. a Standard. The walls of the manhole are built up of separate hori-zontal layers or rings of concrete blocks of two different sizes andshapes—eight blocks to a ring, laid on a six-inch foundation of con-crete. The four end wall blocks, exactly similar in size and shape,are adapted to be reversed or turned end for end in each separatelayer so that all joints are broken, or staggered, as shown by thesectional elevation. The blocks can be made any suitable height. In moulding, groovesare formed in the flat surfaces of the blocks (Figs, i and 4) prefer-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
