. Canadian journal of agricultural science. Agricultural Institute of Canada; Agriculture. January, 1922. SCIENTIFIC AGRICULTURE 149 headway until many of the prominent pub- lie buildings in Europe were protected. Occasionally a building with rods on it was damaged, and the opponents of course seized upon these accidents to bolster up their objections. The supporters, however, studied all cases minutely in an endeavour to perfect the system of protection and thus avoid such occurrences. In America, where fine buildings were less numerous, development was largely in the direction of rodding rur
. Canadian journal of agricultural science. Agricultural Institute of Canada; Agriculture. January, 1922. SCIENTIFIC AGRICULTURE 149 headway until many of the prominent pub- lie buildings in Europe were protected. Occasionally a building with rods on it was damaged, and the opponents of course seized upon these accidents to bolster up their objections. The supporters, however, studied all cases minutely in an endeavour to perfect the system of protection and thus avoid such occurrences. In America, where fine buildings were less numerous, development was largely in the direction of rodding rural buildings, and the work was for the most part in the hands of men who knew nothing about electricity or the principles involved in lightning protection; hence the material and installations were often inferior and this led to losses which cast discredit,on all rodding whether good or bad, not to mention the lightning rod swindles that were perpetrated. However during the last twenty or twenty five years, a number of lightning rod firms both in Canada and the United States have been standardizing the business, both as to material and workmanship and thus raising the in- dustry to a higher plane. In the midst of this Agricultural colleges began to inves- tigate the efficiency of lightning rods by collecting data as to the comparative damage done by lightning to rodded and unrodded buildings. The Ontario Agricul- tural College was fortunate in being the first to obtain decisive results, and in publishing its Bulletin 220, which esta- blishes beyond possibility of doubt that good lightning rods properly installed are almost absolute protection against light- ning. This conclusion was established through data collected for the College by the Mutual Insurance Companies. The method of calculating the efficiency may be illustrated from data for 1912, the first year for which the efficiency was determined. In that year out of every 7000 unrodded buildings insured by the report- ing c
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