. The Locomotive . e as the one illustrated last year, namely, 20 feet long, and of similar details, except as to the size of the door, which was 16 by 24, are not at hand,and definite particulars of this case must be omitted, but the remarks that were madelast year upon the theories usually advanced by theorists and others upon the subject ofboiler explosions are ajiplicable to this case, and they are republished below, copied fromthat report: DISCUSSION OF EXPLOSION THEORIES. From The Locomotive, vol. X, No. 7, old series. If the above simple history is not treated as a
. The Locomotive . e as the one illustrated last year, namely, 20 feet long, and of similar details, except as to the size of the door, which was 16 by 24, are not at hand,and definite particulars of this case must be omitted, but the remarks that were madelast year upon the theories usually advanced by theorists and others upon the subject ofboiler explosions are ajiplicable to this case, and they are republished below, copied fromthat report: DISCUSSION OF EXPLOSION THEORIES. From The Locomotive, vol. X, No. 7, old series. If the above simple history is not treated as a sensational fiction, and if the casereceives that calm consideration to which its importance entitles it, then it seems tosuggest the propriety of a thoughtful review of all the fancy explosion theories, for noneof them seem to be applicable to it. These theories are mostly based on the supposition that by some means, explainedin a half a dozen different ways by as many theoretical experts, there is a sudden evolu-. Fig. 2. tion of force within the boiler, too powerful to be resisted by any practicable (perhaps more practical) experts teach us that this force, though sudden and pow-erful, may be successfully resisted by a boiler constructed and set according to theirelaborate and expensive plans. This sudden evolution of force is said, by these experts, to arise from overheatingthe water by contact with highly heated plates, or from superheated steam through whichthe water is diffused on being relieved of superincumbent pressure by a sudden escape ofsteam; and numerous cases are cited in proof where boilers have exploded from thiscause on starting up the engine, or on an increase of load suddenly put upon the engine,which is followed by an automatic opening of the throttle-valve. An increase of pressuremay occur from these causes, and to very many weak boilers they have probably provedthe final straw which broke the camels back,1 but to magnify these into shocks
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