. Popular electricity magazine in plain English. ation ditch which ittaps is not being used for agriculturalpurposes. Luckily, Salvadorian farmersdo not labor during the night, so thatSonsonate is aglow of evenings as a gen-eral rule. STEAM FOR THE SOIL For some time certain growers oftomatoes, cucumbers, and similar vege-tables for the London market have beeninjecting steam into the soil with a viewto destroying certain insects and is reported that the plan works verywell for that purpose, but the operationbrought to light an unexpected fact;namely, that the soil thus treated in-crea
. Popular electricity magazine in plain English. ation ditch which ittaps is not being used for agriculturalpurposes. Luckily, Salvadorian farmersdo not labor during the night, so thatSonsonate is aglow of evenings as a gen-eral rule. STEAM FOR THE SOIL For some time certain growers oftomatoes, cucumbers, and similar vege-tables for the London market have beeninjecting steam into the soil with a viewto destroying certain insects and is reported that the plan works verywell for that purpose, but the operationbrought to light an unexpected fact;namely, that the soil thus treated in-creased greatly in fertility, so greatly, infact, that the ordinary amount of manurecannot be used afterward. This effect has been explained as beingdue to the sterilization produced by thesteam, which kills the phagocytes orprotozoa which in ordinary circumstanceskeep down the number of bacteria in thesoil whose operations are beneficent inturning organic nitrogen into a formsuitable for plant lx\. 1264 POPULAR ELECTRICITY and the WORLDS ADVANCE. sih H O SI►4 ° PS o sa w POPULAR ELECTRICITY and the WORLDS ADVANCE 1265 ROAD OF A TELEPHONECALL The chart shown on the opposite pagewas primarily intended for the informa-tion of telephone employees, but it is sosimple and so clear that it is entirelyintelligible to the lay reader. Aftertracing the path of a telephone call in anycity system of a size sufficient to maketrunking necessary; after consideringthat the line shown is but one of a net-work of thousands which in the exchangesare woven into almost solid masses; whenit is remembered that the chart shows thegeneral* path only and leaves out ofconsideration all the hundred and onedelicate relays, induction coils, keys,signal lamps, etc., it is difficult to com-prehend why more messages do not goastray as they pulsate through thislabyrinth. This chart, first elaborated by theTelephone News and later reproducedby the Transmitter, through whose cour-tesy the plate was obtained, shows
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectri, bookyear1912
