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DEPARTMENT OF THE INTERIOR

UNITED STATES GEOLOGICAL SURVEY

GEORGE OTIS SMITH, DIRECTOR

ORGANIZATION, EQUIPMENT, AND OPERATION

OF THE

STRUCTURAL-MATERIALS TESTING

LABORATORIES AT

ST. LOUIS, MO.

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ILLUSTRATIONS.

Page.

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PLATE I. General view of buildings occupied by structural-materials test

ing laboratories.
II. Interior views of constituent-materials laboratory.
III. A, 40,000-pound hydraulic hand-power compression machine; B,

Accelerated test apparatus for soundness tests of cement; C, Attach-
ment for testing short transverse test pieces on Olsen long-lever

cement-testing machine
IV. A, Method of handling void apparatus; B, Hopper for filling void

apparatus
V. A, Apparatus for determining percentage of voids; B, Apparatus and

connections for making void test on “one-size” material
VI. A, Apparatus and connections for determining specific gravity of sand

and screenings; B, Apparatus for removing silt from stone screen-
ings; C, Apparatus and connections for determining specific gravity

of large material
VII. A, Bumping screen for making granulometric analysis; B, Method

of filling one screen with material retained on another. VIII. A, Implements used in making density tests of mortars; B, Cast-iron

cube and cylinder molds; C, Spherical bearing blocks for com

pression tests...
IX. A, Typical failure of concrete cylinder; B, Failure of concrete cyl-

inder-rupture through aggregate; C, Compressometers for meas-
uring deformations of cylinders; D, Typical cones formed by

rupture of concrete cylinders ..
X. A, 200,000-pound compression machine; B, Concrete mixer, charg-

ing end, 1 cubic yard capacity ...
XI. A, Apparatus for finishing top of bond-test specimens; B, Beam

selected at random to show accuracy of rod spacing; C, Gang saw

for cutting cubes from blocks of stone..
XII. Room for molding beams....
XIII. Interior view of moist room for storage of test pieces.
XIV. Interior view of testing room, beam section.
XV. A, Plain-concrete beam in testing machine with deformeters in

place and stirrups for supporting beam at third points; B, Re-
inforced-concrete beam in testing machine ready for application

of load.
XVI. A, Attachment and micrometer for measuring slip of rods; B, Steel

carriage for handling beams...
XVII. Method of recording character of reinforced-concrete beam failures..
XVIII. A, Henning steel extensometer for measuring elongation of steel;

B, Method of making bond test..
XIX. A, Shear specimen in machine ready for test; B, Interior view of

storage room, building-block section..

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