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Deaconess in the Ancient and Medieval Church: A Study in the History of Christian Institutions
Written in partial fulfillment of the Ph.D., Union Theological Seminary
De Rham House
De Rham House, Fifth Avenue and Ninth Street
De Re Metallica
An illustration of two mine shafts. The man on the hill uses plumb lines and triangulation to determine subterranean distances.
De Re Metallica
An illustration of a mine ventilation system. The vane (H) orients the wooden vessel (A) so that the vent (C) faces the wind. The wind forces fresh air through a pipe (D) and into the mine.
De Re Metallica
A cross-sectional illustration of a mine. A turbine powers three subterranean piston pumps in succession to drain a flooded mine shaft.
De Re Metallica
A cross-sectional illustration of a mine. Gears and drive-shafts harness horse power to operate an underground ore lift.
