Blakelee's industrial cyclopedia, a simple practical guide .. A ready reference and reservoir of useful information More than two hundred illustrations . CONSTRUCTION OF LIGHTNING RODS. 91 thick. Straight legs four inches wide and three feet long. Step supports fiveinches wide and forty-four inches long. Side pieces about twenty-two incheslong and four inches wide. The back piece four inches wide and eighteeninches long. The ladder should be eighteen inches wide, which will allow the topto project an inch each side. The steps should be wide enough to correspond. DOUBLE BRACE FRUIT LADDER, HAND
Blakelee's industrial cyclopedia, a simple practical guide .. A ready reference and reservoir of useful information More than two hundred illustrations . CONSTRUCTION OF LIGHTNING RODS. 91 thick. Straight legs four inches wide and three feet long. Step supports fiveinches wide and forty-four inches long. Side pieces about twenty-two incheslong and four inches wide. The back piece four inches wide and eighteeninches long. The ladder should be eighteen inches wide, which will allow the topto project an inch each side. The steps should be wide enough to correspond. DOUBLE BRACE FRUIT LADDER, HANDY STEP LADDER. with the bracing legs, and three in number, at equal distances apart. Theyshould be grooved in, but if one is not prepared to do that, they may be held inplace by three two inch screws at each end. Whitewood boards, three-fourthsthick, are heavy enough for all but the top. CONSTRUCTION OF LIGHTNING RODS. Use§ of lilglitiiiiig Rods.—Lightning rods are not wholly for the pur-pose of conducting flashes of lightning to the earth, as is very commonlysupposed, but they are a means of safety to buildings, by silently transmittingthe electric fluid from cloud to earth during thunder storms, and no doubtmany times prevent disruptive discharges. Defects in Puttings up Rods.—The rods should be well put up ; ifnot, they are no protection. If the joints are so constructed as to becomepartial insulators, a heavy charge of lightning will very likely leave the rodand do great injury to the building. 92 CONSTRUCTION OF LIGHTNING RODS. Another importan
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