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Scientific American, Vol. 61, No. 16 (1889) (1889)

leaf 8

An illustration from Scientific American, Vol. 61, No. 16 (1889), 1889, leaf 8
. Add to all of them are thus encumbered, that fact must always wedged in between. In other words, the two pits are this the height of the upper passageway and the be taken into consideration in every estimate. really but one, the upper portion being divided by a overarching Shelby’s Dome, and the… … certainly have demonstrated that six or more were so close together as to leave barely great pits are united into one subterranean room for us to lie on our faces and pull our apartment of magnificent proportions. It is respect- selves out on a rock overhanging theabyss. This pit venient ledge, I…

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