. The Street railway journal . street Section A-A, THIRD-KAIL JOINT AFTER ADDITION OF BOND blows shall be rated as 100. Other insulators shall be ratedat the number of blows respectively on which they developfracture. The average of these ratings shall not fall belowtwenty-five blows for the type I. insulator and a propor- SFACING AT JOINTSIn laying the third rail a space of about ^ in. is left ateach joint for expansion and contraction. The exact dis-tance allowed depends upon the temperature at the time the

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884