A WEEKLY JOURNAL OF PRACTICAL INFORMATION, ART, SCIENCE, MECHAHCS, CHEMISTRY, AND MANUFACTURES. Vol. XXVIII.—No. 20. [93 per Annum, NEW YORK, MAY 17,1873. ] IN ADVANCE. [NEW SERIES.] IKFBOVED BOLT HEADIKG UACHIRE. Pneumatic Foundations. one half inch in diameter, with other sizes in proportion-…
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