. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. SHADE TREES. 241 electric systems are a source of danger from lightning, and we have ob- served cases where large limbs have been destroyed and the trunks of the trees badly lacerated by electrical discharges from these wires. On the whole, the cases of death to trees from electricity are by no means so numerous as is generally believed. Because a large number of. Fig. 100. —Showing electrolysis of gas pipes. (After A. A. Knudson, " Corrosion of Metals by ;) trees near electric roads, etc., often lo
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. SHADE TREES. 241 electric systems are a source of danger from lightning, and we have ob- served cases where large limbs have been destroyed and the trunks of the trees badly lacerated by electrical discharges from these wires. On the whole, the cases of death to trees from electricity are by no means so numerous as is generally believed. Because a large number of. Fig. 100. —Showing electrolysis of gas pipes. (After A. A. Knudson, " Corrosion of Metals by ;) trees near electric roads, etc., often look sickly it must not be concluded that electricity is always the cause. In cities and towns, where most of these unhealthy specimens are found, there are innumerable destructive factors for trees to contend with. It is quite essential in diagnosis work, therefore, that all of these factors be taken into consideration before a definite opinion in regard to the cause of any abnormal condition is formed. Electrolysis. Direct current electricity is frequently responsible for electrolysis of gas and water mains, and lead coverings of underground telegraph circuits are often affected. The trouble is often so serious that the iron gas and water pipes become corroded and eaten with holes in a few weeks or months, causing leakage. When gas mains are affected by electrolysis, the gas escapes and permeates the soil, so that electricity sometimes be- comes a primary and gas a secondary factor in the death of The phenomena associated with electrolysis are often complex and difficult to do away with entirely, according to expert electricians, but much of the trouble can be eliminated by proper bonding of the rails of electric roads and the grounding of different systems. Electrolysis is more common in wet than in dry soils. Cases are on record where severe electrolysis has taken place 700 or more feet from the source of the leakage. It more often becomes troublesome in cities wher
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