Improved Boring and Mortising Machine. the saw and the ingenious device by which when the boring apparatus is at work it is dropped out of the way. This device con sists in placing the saw mandrel in bearings on an arm F. This arm is fast at G and swings on a pivot there so that by taking depressing it the saw is carried down through the table out of the way. When wanted for use it is easily set up tight by the screw in the supporting arm H which bears against the slotted arm. The gage for governing the width of the stuff split is here shown at I. Piaster of Paris. It is called indifferently alabaster or gypsum ; and selenite. Massive alabaster occurs in Britain in the lurlan strata known as the Onondaga salt group. It Is excavated for agricultural purposes. KLARR'S BORING AND MORTISING MACHINE. these facts in relation to gypsum or plaster of I reous salt occurs in, scientific american, 1865-06-17
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