Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 777
hold the clay down, they piled more rockon top of it. You see, that makes a pretty goodcovering for the tunnel, because water cant runthrough clay. We ought to have a fairly drytunnel; and we expect that as soon as we get pastthis reef the work will go along humming. By the way, speaking of an… … In/irn sand an excavatedpoci^tt fiUed u^Uiplasicccloj/ ts >r^aj£e in advance •3 ^^3^ VfaCcrTtamextended ~ I J on- = I. riRSr STAGE OF DIGGING A\V.\YIHE SAND AT THE TOP. I. SECOND STAGE—READY TOADVANCE THE SHIELD. A clay blanket I What do you mean? Well, replied Perry, this is the way it…
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