nded for sawing and mortising fence for further information. at Chellaston, in Derbyshire; near Droitwich it is rails, but which can be readily used for any work re- associated in the marl with rock salt, in strata res- quiring similar manipulation, such as the framing of Plaster of Paris.… … set up tight by the screw in XLAHR'S BOEING AND MORTISING MACHINE. stone or Zechstein. In the the supporting arm, H, United States this calca- relation to gypsum, or plaster of I reous salt occurs in numerous lenticular masses in The gage for which bears against the slotted arm. these facts…
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