of a hollow brick. One of machines recently brought out by the extensive wood tool the single blocks is 2 feet long, 1 foot wide, and 9 inches builders J. A. Fay & Co., Cincinnati, Ohio, whose fine ex- high, in the center of which are apertures formed by groov hibit atthe Centennial Exposition we… … ings in the sides, the pressure being pro- brick and stone is well known. A com- duced by volute steel springs and gradu- mon brick absorbs about a pint of water, ated by screws to such pressureas desired. The pressure a cloth until it will attract light bodies. If, now, it be al and a small house…
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