a specimen of incrustation (which all; and the tube sheets are | of an inch in thickness. would no doubt be best to prevent the formation of scale is more than half an inch in thickness) that was removed In addition to these, she has independent (steam) fire altogether ; you recommend the use of… … these astringent substances, when puppet valve, d, Fig. 3, is con- set free in the boilers, attacks the structed in its bottom, and the slid- metal, and soon eats it through at n9.2 ing drawer, J, is arranged in the the rivets and joints. If this is so, curb. When the bucket has been then, of…
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