. Annual report of the Railroad and Warehouse Commission of the State of Illinois . Spark-Gap Method. Test voltages below 35,000 volts shall be determined by transformerratio. (1) Working Unit Stresses.—Ohiained by dividing the ultimate break-ing strength by the factors given under paragraph k. Lbs. persq. in. Structural steel-Tension (net section).Shear Compression. Rivets, pins-Shear Bearing Bending Bolts-Shear Bearing Bending Wires and cables-Copper, hard-drawn, solid, B. & S. gauge, 4/0, 3/0, 2/0 Copper, hard-drawn, solid, B. & S. gauge, 1/0 Copper, hard-drawn, solid, B. & S. ga
. Annual report of the Railroad and Warehouse Commission of the State of Illinois . Spark-Gap Method. Test voltages below 35,000 volts shall be determined by transformerratio. (1) Working Unit Stresses.—Ohiained by dividing the ultimate break-ing strength by the factors given under paragraph k. Lbs. persq. in. Structural steel-Tension (net section).Shear Compression. Rivets, pins-Shear Bearing Bending Bolts-Shear Bearing Bending Wires and cables-Copper, hard-drawn, solid, B. & S. gauge, 4/0, 3/0, 2/0 Copper, hard-drawn, solid, B. & S. gauge, 1/0 Copper, hard-drawn, solid, B. & S. gauge, No. 1 Copper, hard-drawn, solid, B. & S. gauge, No. 2, 4, 6 ■ Copper, soft-drawn, solid, B. & S. gauge Copper, hard-drawn, stranded Copper, soft-drawn, stranded Aluminum, hard-drawTi, stranded, B. & S. gauge under 4/0 Aluminum, hard-drawn, stranded, B. & S. gauge 4/0 and over. 18,00014,000 10,00020,00020,000 8,50017,00017,000 25,00027,50028,50030,00017,00030,00017,00012,00011,500 Untreated timber Bending—lbs. per sq Compression persq. Eastern white cedar Chestnut Washington cedar Idaho cedar Port Orford cedar Long-leaf yellow pine Short-leaf yellow pine Douglas fir White oak Red cedar Bald cypress (heartwood) Redwood , Catalpa Juniper L Length in inches. D Least side, or diameter, in inches. (m) Character of Cotistruction.—The character of the material enter-ing into the construction of crossing spans and the installation of same mustconform to modern practice. GENERAL BEQUIBEMEXTS Sectio?^ e. (a) Conductors.—By the term conductor, circuit or cableas used in these rules is meant any metal conductor whatsoever used as ameans of transmitting electric current. (b) CradZes.—Cradles or slatted platforms will not be permitted in con-nection with the aerial crossing of any line. It is the intent and purpose 478 of these rules to require the construction of the crossing spans to be of suchsubstantial character as to make the use of cradles or platforms unnecessary
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