. Journal of electricity. one voussoir— length of one voussoir— X = 234 ft. Weight of one voussoir at crown— X 1-25 X 145 — 424 of one voussoir at abutment— X 1-43 X 145 = 485 component (supported by arch) of voussoir at crown— 424 X Cos. 50° — 273 lbs. Weight component (supported by arch) of voussoirat abutment— 485 X Cos 50° = 312 lbs. higher elevation, and therefore sustains less waterpressure than corresponding points at the abutments. For the case under consideration, where the lengthof the upstream radius is ft., the sub
. Journal of electricity. one voussoir— length of one voussoir— X = 234 ft. Weight of one voussoir at crown— X 1-25 X 145 — 424 of one voussoir at abutment— X 1-43 X 145 = 485 component (supported by arch) of voussoir at crown— 424 X Cos. 50° — 273 lbs. Weight component (supported by arch) of voussoirat abutment— 485 X Cos 50° = 312 lbs. higher elevation, and therefore sustains less waterpressure than corresponding points at the abutments. For the case under consideration, where the lengthof the upstream radius is ft., the subtended angle120° and the inclination of the arch 50° with a hori-zontal plane, 40° with a vertical plane, a point at thecrown will always beRu — X sin 40° = 11,55 X = above a corresponding point at the springing the crest this difference in elevation makes alarge difference in the distribution of the load on theface of the arch, and therefore also in the location of. / _$-«-_ _ ^««.„ *» .w/W. -*l UPPER ARCH TRUSSES WITH FILLERS—FIG. 3 the line of pressure in the arch ring. Take, for in-stance, an arch slice 1 foot wide with the middle of thecrown at elevation 5, and with the middle of this sliceat the springing line at elevation 5 + = eleva-tion With reservoir full to the crest, the water-load at the middle point of the crown would correspond May 1, 1918] JOURNAL OF ELECTRICITY 449 to 5. X = pounds per sq. ft., whereas thewater pressure at the corresponding point at thespringing line would correspond to X =
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