mberless purposes that need not be mentioned. barometric pressure, by which the gases and vapory parti- In Fig. 1 of the engravings is shown a horse power and cles in the soil rise within the area covered. We have seen boom hoister for working a derrick, a powerful machine, the application of… … the boom by hand. For quarrying this other marshy places, the cellars of houses Fig. 1—DERRICK HORSE POWER AND BOOM HOISTER. machine is peculiarly adapted. <A stone ‘are surrounded at all times by water, or can be placed in or out, the full sweep rather the supersaturated soil. But builders The…
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