he action of the tool In the matter of up through the passage, A, and through the valve, mandrels—arbore, as B, into the chamber above, while the water tuns many call them—noth- out through the apertures, C. The sand, etc., remains ing bas been said, but it isa very uzeful tool. Man- in, and… … seen when work is to Le put together. Moreover, are large, thetrouble mentioned is not experienced. may be removed. This plan of forming a sand Itis convenient to have two sizes in the tool so many persons use little caution in settiny their pump in the boring tool, besides the convenienee work in…
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