. Amerikanischer Ingenieur und Eisenbahnjournal. Er lokalisiert, wo das oneshown durch die gestrichelten Linien gesetzt wird. In dieser besonderen Stellung wird das zentrale Schiff nicht gebaut, und der Kran fährt eine lange Linie von Gebäudeanlegeplätzen hinunter, von denen das Schiff seitwärts in das Wasser, das an der rechten Seite der Gravur iudicated wird, abgelassen wird. Wir wollen nicht, dass er wie immer so verstanden hat, dass der Start am Ende oder am Heck in diesen Werften nicht so verwendet wird, wie er ist, aber der Start am Heck wurde auch für viele der größten Schiffe eingesetzt, die von der Firma gebaut wurden. DER EINFLUSS DER ZIRKULATION AUF DIE VERDUNSTUNGSEFFIZIENZ VON WA
1587 x 1575 px | 26,9 x 26,7 cm | 10,6 x 10,5 inches | 150dpi
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. American engineer and railroad journal . he located where the oneshown by the dotted lines is placed. In this particular in-stance the central vessel is not built, and the crane travelsdown a long line ot building berths from which the vessel islaunched sideways into the water that is iudicated at the rightof the engraving. We do not wish to he understood, how-ever, as stating that the end or stern launch is not used inthese yards as it is, but the side launch has also been employedfor many of the largest vessels built by the firm. THE INFLUENCE OF CIRCULATION ON EVAPORATIVE EFFICIENCY OF WATER TUBEBOILERS. Is our issue for June we published a paper on water-tubeboilers, and the discussion thereon by the members of theAmerican Society of Mechanical Engineers. Those of ourreaders who have followed the matter will be interested in apaper recently read before the Institution of Naval Architectsby Mr. John I. Thorneycroft. For the engravings used inillustration of the paper we are indebted to the Engineer. Mr.Thorneycroft said :. : Fig. 1. • To obtain the highest evaporative duty from a given tubeservice, it is necessary that the contents of the tube shouldconsist of, as far as possible, water only ; and to attain thisresult the steam must have the freest possible egress from thetubes, and must also be carried from them by an energeticcirculation of water in a constant direction. To some of theleading features which affect these conditions I would nowcall your attention. Considering the boilers shown in figs. 1and 2, if the pressure in the lower vessel—that is, at the bot-tom ends of the generating tubes—is due to the full depth ofwater in the boiler, in addition to the steam pressure, then anyreduction of density in the generating tubes will all be avail-able tor causing circulation ; and thus any reduction in press-ure in the lower vessel, below that due to the head of waterin the boiler, is a direct loss to the energy of circulation, sothat variations of this
