Technical paper . A. DERRICK WITH SERIES OF FIVE SUPPORTING B. SAFETY GATE IN DOOR OPENING ON RAILWAY TRACK. SAFETY IN QUARRY EQUIPMENT. 15 be used only in the case of a stationary boom, as one which is freeto be raised or lowered must be supported only at the end. Onaccount of the varying and excessive strains placed upon booms, theyand their supports should possess a wide margin of safety. QUARRY STAIRS AND LADDERS. Safe and easy access to quarry excavations is desirable. Fordeep quarries stairs with numerous landings and secure handrailsshould be provided. They should be so situated
Technical paper . A. DERRICK WITH SERIES OF FIVE SUPPORTING B. SAFETY GATE IN DOOR OPENING ON RAILWAY TRACK. SAFETY IN QUARRY EQUIPMENT. 15 be used only in the case of a stationary boom, as one which is freeto be raised or lowered must be supported only at the end. Onaccount of the varying and excessive strains placed upon booms, theyand their supports should possess a wide margin of safety. QUARRY STAIRS AND LADDERS. Safe and easy access to quarry excavations is desirable. Fordeep quarries stairs with numerous landings and secure handrailsshould be provided. They should be so situated that workmen areobliged to cross over a minimum of loose rock or slanting unevenfloor between the foot of the stair and the working place. Doublehandrails should be provided where the stair is open at both sides,though a single rail is sufficient where one side of the stair is protectedby the quarry face. The handrail should be high enough to preventa person from falling over, and a parallel rail should guard the spacebetween it and the stair as shown in Plate I
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
