. Cassier's magazine. lar opera-tion. Probably the greatest simplicityis secured by driving fans for mechani-cal draught by steam engines. It wouldseem that the possible greater economyof an electric motor-drive would besomewhat offset by the increased com-plication of the regulating and control-ling mechanism. Published informationin regard to motor-driven draught fans,their economy, and cost of operation incomparison with the single-fan engineslargely in use to-day would be welcometo designers. Enough has been said to indicate theimportance of thoroughly going overthe draught question before
. Cassier's magazine. lar opera-tion. Probably the greatest simplicityis secured by driving fans for mechani-cal draught by steam engines. It wouldseem that the possible greater economyof an electric motor-drive would besomewhat offset by the increased com-plication of the regulating and control-ling mechanism. Published informationin regard to motor-driven draught fans,their economy, and cost of operation incomparison with the single-fan engineslargely in use to-day would be welcometo designers. Enough has been said to indicate theimportance of thoroughly going overthe draught question before decidingoff-hand to use either the chimney or itsrival. If more space has been given inthese comments to the advantages ofmechanical draught over chimneys, itis only because the good points of theartificial method are as yet unrecognisedin many places. Experience is notwanting with either method, and therewould seem to be no excuse for notanalysing both sides of the draughtproblem in deciding which combinationto (torrent gppxzs While the telephone was brought toJapan in the earliest days of telephoneengineering,—about 1877,—^ts practi-cal use was confined to auxiliary policeservice, and it was not until 1883 thatthe idea of starting telephone exchangesoccurred to the authorities. A companywas promoted for carrying on the busi-ness, and a petition was forwarded tothe government asking for a license tostart an exchange and carry on tele-phone service in Tokyo. That was in1884. The question whether it shouldbe carried out as a government under-taking or entrusted to private capitalremained unsettled until 1889, when itwas decided, after deliberation, to un-dertake the work as a state told by Saitoro Oi, in a paper readbefore the International Electrical Con-gress at St. Louis, an executive officewas opened in Tokyo, and .letters andcirculars were sent out to business men,to the nobility, to government officials,to manufacturers, and, in fact, toany person in
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