. A manual of marine engineering: comprising the design, construction, and working of marine machinery. ch draws from thesmoke-box and delivers into the funnel; this is known as the induceddraught system. The first of these methods is the older and commoner form; it is notvery effective, and by no means economical, as there is loss of both coal andfresh water ; it also quickly wears out the funnel; but it has the merit ofbeing cheap in first cost, and does well enough if it is only required to beused occasionally to quicken the fires in getting up steam, or during a hotday when steaming with a
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. ch draws from thesmoke-box and delivers into the funnel; this is known as the induceddraught system. The first of these methods is the older and commoner form; it is notvery effective, and by no means economical, as there is loss of both coal andfresh water ; it also quickly wears out the funnel; but it has the merit ofbeing cheap in first cost, and does well enough if it is only required to beused occasionally to quicken the fires in getting up steam, or during a hotday when steaming with a fair wind, or no wind at all. The second planhas the merit of simplicity, and has been made by Mr, James Howden andothers very efiective by their special systems. There is no danger withit, and it may be applied to any kind of ship. The third plan is one whichis universally adopted in warships, and also in some large and small mer- ARTIFICIAL DRAUGHT. 365 chant ships. It is a costly plan, and necessitates a complete change in theship arrangements in the boiler compartment. It is undoubtedly a most.
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