Modern marine engineering; with an appendix, bringing the information down to the present time - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1881 Excerpt: ...may assume a uniform temperature. This it will do under the pressure of the atmosphere, and it is thus accomplished in this instrument, which renders it applicable to boilers in which the pressure of the steam may vary, or in which either high or low pressure steam is used. The "Gathercole-How" and the "Long" salinometers are manufactured by Messrs. Soul and Co., of Finsbury-gquare, who kindly supplied the working drawings from which these presented were reduced. Enough has been stated to render obvious the defects common to the use of condensation with marine engines. It will be observed, on reflection, that, although the density of the sea water has been quoted, practically the boiler--even with injection condensers--is fed from the tank or discharge pipe, as a rule; and it is only when the donkey or sea-feed pump is used that the natural sea water is admitted into the boiler. The gain with surface condensers is only certain when the sea water is partially introduced in the distilled-water tank; and in no case whatever should this be omitted--i. e. a perfect amalgamation of the distilled and sea water should ensue before either enters the boiler. There is a just cause for this, from the fact that were the sea water used at intervals in its natural state, an uneven incrustation must result therefrom; and it is certain, also, that an entire amalgamation cannot ensue in the boiler when the requisite evaporation is being effected. Now, with reference to the regulation of the density of the water in the boiler, and thereby determining the amount of natural sea water to be admitted in the tank, the more efficient means is to allow a continual surface exit from the boiler, generally termed scumming or surface blow off; by permitting also an e...
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