s a desideratum to have a rapid steam - producing boiler ; a good example is simply an ordinary vertical boiler , having the tubes suspended inside of the fire - box , arranged with an internal tube in each , loosely sup - ported from the tube - plate , these small inside tubes leaving annular… … the fire - box where there are no tubes , this Fig . 12 . — Boiler with Suspended Annular Tubes . a , Shell . opening being blocked up with a lump of fire - b , Fire - box . c , Tubes . d , Fire - brick lump , e , Smoke - pipe . brick suspended by a rod from the top of the F , Fire - door boiler ,…
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