. Factory and industrial management . nd the removalof scale from the interior of such a coilneed not be a difficult matter. In the engraving A is the inlet valvefrom pump; B B, heating coils; C, feedvalve; D, check valve to boiler ; E, circu-lating valve, with internal pipe to bottomof boiler; F, safety valve; G, intermedi-ate valve; H, feed pipe. We are also inclined to take with somegrains of salt the statement that, in thecase of the steamship Dione, fitted withthis heater, the actual coal-consumptionis reduced from 35^ tons to 31 tons, orabout \^y2 per cent. A reason assigned for this gai
. Factory and industrial management . nd the removalof scale from the interior of such a coilneed not be a difficult matter. In the engraving A is the inlet valvefrom pump; B B, heating coils; C, feedvalve; D, check valve to boiler ; E, circu-lating valve, with internal pipe to bottomof boiler; F, safety valve; G, intermedi-ate valve; H, feed pipe. We are also inclined to take with somegrains of salt the statement that, in thecase of the steamship Dione, fitted withthis heater, the actual coal-consumptionis reduced from 35^ tons to 31 tons, orabout \^y2 per cent. A reason assigned for this gain in economy over the theo-retical is that the apparatus acts as a cir-culator ; and some portion of the savingis probably due to its action in this re-spect ; for, when fires are lighted in a coldboiler, or when fires are put away afterbeing banked for some time, the coilscommence to draw the coldest water fromthe bottom of the boiler through thevalve, E, and deliver it again through theboiler check valve, D, at a high THE H4RMAN FEED-WATER HEATER It is said, in support of this claim andthe reason assigned for it, that in half anhour after lighting one fire in one boilerof the above-mentioned steamer, and be-fore the fire had entirely covered thegrate bars, the temperature of the waterat the outlet of the coils was 200 deg.,and the rattling of the check valve showedthe circulation to be most active. A Balanced Water Gage. One of the practical annoyances thathave attended the increase in workingsteam pressure has been the frequent 512 MARINE ENGINEERING. 513 breakage of water-gage glasses. A brokenglass renders the gage useless, and yet theindications of the water gage are indispen-sable to the safe operation of a steamboiler. The breaking of the glass has evenled up to serious accident, as was the casein the disastrous explosion on the Britishwarship Blake. The substitution of talcfor glass has proved that a transparent ma-terial capable of sustaining the requir
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Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectengineering
