The Locomotive . ressure gauge afew pounds ahead, and see if the results are just as satisfactory. Theincrease in presstire from fifty pounds to one hundred pounds increasesthe stress in the material one hundred per cent and reduces the marginof safety by fifty percent, while the heat content of the steam at onehundred pounds pressure is but approximately one per cent greaterthan of steam at fifty pounds pressure. Just by way of emphasizinghow little thought is given to even primary safety requirements by 1927.] THE LOCOMOTIVE 167 some i)coi)lc operating pressure vessels, I would nieiUion a re
The Locomotive . ressure gauge afew pounds ahead, and see if the results are just as satisfactory. Theincrease in presstire from fifty pounds to one hundred pounds increasesthe stress in the material one hundred per cent and reduces the marginof safety by fifty percent, while the heat content of the steam at onehundred pounds pressure is but approximately one per cent greaterthan of steam at fifty pounds pressure. Just by way of emphasizinghow little thought is given to even primary safety requirements by 1927.] THE LOCOMOTIVE 167 some i)coi)lc operating pressure vessels, I would nieiUion a recent ex-perience of one of our Michigan ins-pectors. He visited a food prepar-ing plant. As a matter of fact, it was a cheese factory* He was tomake the preliminary inspection of a boiler which had previously beenuninspected and uninsured. Aside from a number of defects resultingfrom operating conditions, the boiler appeared to be an average the inspector could not locate the safety valve. Upon inquiring. Fig. 2. of the engineer he learned that the factory inspector had visited thepremises but a short time before and that during the visit the safetyvalve of the boiler operated automatically. When it did so, a consider-able cloud of soot was discharged from the boiler room into the cheesemaking department. Quite naturally the factory inspector objected tothe preparation of food in just that way. Those in charge interpretedhis objection as being directed at the safety valve, and proceeded toremove the offending member just as soon as the boiler could be takenfrom service. They explained to our inspector that the Factory In-spection Laws of Michigan do not permit the use of a safety valve ona boiler in a cheese factory. It had apparently not occurred to themthat the safety valve could be adjusted to discharge in some otherdirection. Familiarity breeds contempt. The truth of this old sayingappears to us quite frequently. The man who has observed a certain 268 THE LOCOMOTIV
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