Public works . use of dynamite as a labor, cost and time-saving agentis worthy of consideration. Dynamite is especially valuable inditching in soft mud areas, in swamps where roots, vines, brushand mud make hand ditching costly, in underwater work, andin clearing logs and debris from watercourses. Though its useis limited mainly to localities where there is a saturated soil,it is a valuable and reliable agent, where it can be used. Thecost of ditching with dynamite is about two-thirds the cost ofhand ditching, but its chief value is as a time saving elementThree or four men with d
Public works . use of dynamite as a labor, cost and time-saving agentis worthy of consideration. Dynamite is especially valuable inditching in soft mud areas, in swamps where roots, vines, brushand mud make hand ditching costly, in underwater work, andin clearing logs and debris from watercourses. Though its useis limited mainly to localities where there is a saturated soil,it is a valuable and reliable agent, where it can be used. Thecost of ditching with dynamite is about two-thirds the cost ofhand ditching, but its chief value is as a time saving elementThree or four men with dj-namite can do the work of manytimes that number of hand ditchers. October 18, 1919 MUNICIPAL JOURNAL AND PUBLIC WORKS 239 With competent handling, ditches of almost any size ordepth can be blown. Fifty per cent or sixty per cent straightdynamite is generally most satisfactory and cheapest for thisclass of work. This can be exploded by the propagationmethod from one stick fired by cap and fuse in the middle of. DITCHING SWAMP SURROUNDED BY HILLS. a long string. Firing by electric current is highly satisfactory,but more costly; much time is lost in arranging and fixing con-nections. For ditches 2}/^ to 4 feet deep and 2 or 3 feet wide, asingle row of sticks spaced about 18 inches apart can be charges may be placed 18 to 24 inches in the ground andthe firing done in sections of 100 feet at a time. For widerditches, two or more rows, staggered, may be used. Deeperditches can be blown by using relays. For under-water ex-cavating, removing log jams, deeply imbedded logs and debrisfrom stream beds, dynamite is also very valuable. In all dyna-mite work, an expert should be employed. It is far best to se-cure from the dynamite company the services of a competentman; such a man will pay for himselfseveral times over, even on a smalljob. FISH CONTROL. In addition to the methods of con-trol by drainage, fish control may bea valuable aid at times. In the case ofa lake or pond use
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
