. Earth, sky, and sea. Trieste (Bathyscaphe); Balloons. •«--d--**. Fig. 15. Diagram of strength tests made on model portholes eighteen hours. The other tests made were of shorter duration. Between the two curves is to be found the zone where the plexiglas sustained permanent deformations more or less considerable, but with- out ever having been broken, thus without ever having let a drop of liquid pass through. Experiment No. 4 alone, recorded above the second curve, resulted in the destruction of the model. There is no question in this case of the plexiglas having been defective. It was the c
. Earth, sky, and sea. Trieste (Bathyscaphe); Balloons. •«--d--**. Fig. 15. Diagram of strength tests made on model portholes eighteen hours. The other tests made were of shorter duration. Between the two curves is to be found the zone where the plexiglas sustained permanent deformations more or less considerable, but with- out ever having been broken, thus without ever having let a drop of liquid pass through. Experiment No. 4 alone, recorded above the second curve, resulted in the destruction of the model. There is no question in this case of the plexiglas having been defective. It was the conical hole in the steel plate which splayed on the side where there was low pressure and in these conditions it is clear that the plexiglas could no longer resist. The conical socket had been machined in a plate of mild steel much softer than the special steel of our cabins. As this breakage took place under a load of 1270 atmospheres (corresponding to a depth in the sea of more than 7-4 miles), this test was very reassur- ing. The interior diameter of this model was twice as great as its thick- [ 150]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Piccard, Auguste, 1884-1962. New York, Oxford University Press
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