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During the c a l i b r a t i o n a load c e l l was used t o measure ram load. Applied pressure was indicated by a Baldwin SR-k pressure trans- ducer. Load and pressure were recorded simultaneously on an X-Y p l o t t e r . A t y p i c a l set of load versus pressure curves are shown i n Fig. 7. Using the load versus pressure curve obtained f o r each of the 212 rams e f f e c t i v e area was determined. The average e f f e c t i v e area f o r a l l rams was 9.19 in? while extending the piston, and stand- ard deviation was O.O9. Pumps used i n the slab t e s t s are shown i n Fig. 8. Capacity of the pumps was 3OO in? of o i l per minute at 10,000 p s i . Rams were con- nected t o the pumps using a manifold system of pipe and f l e x i b l e hose. DEFLECTION MEASUREMENT Deflection of the slab was measured with a Wild N3 special indust- r i a l l e v e l ( ^ ) shown i n Fig. 9. This instrument has an i n t e r n a l o p t i c a l micrometer with graduations of 0.001 i n . Two levels were located on the mezzanine inside the building. A t h i r d l e v e l was mounted on the roof. The l e v e l on the roof and one of the levels inside sighted d i r e c t l y on a graxLviated invar bar mounted on a wooden post separate from but adjacent t o the structure. This bar, shown i n Fig. 10, was used as a bench mark t o determine change i n elevation of the levels during the t e s t s . The se- cond l e v e l located on the mezzanine was referenced t o the others by sighting on a scale common to both levels located inside the building. Scales were 10-in. long white-faced p l a s t i c with engraved black gradviations. Each scale was attached t o an al-uminum bracket as shown i n Fig. 10. Graduations were machined i n the p l a s t i c face to expose a dark inner p l a s t i c layer. This type of marking pro- vided d i s t i n c t reading of the scales over the r e l a t i v e l y long 2-7
