. Proceedings of the annual convention . 223 224 PROCEEDINGS OF THE Specimens I to 5 all have both edges rolled. I and 2 were cut about 1-32-inch deep across one face with a coldchisel and broke as shown at first treatment. 3 to 5 were not cut and stood one, two and three treatments, respec-tively, without cracking. Specimens 6 and 7. 6 has two sheared edges and cracked from the rougher edge. 7 has two ground edges and did not crack at all. Specimens 8 and 9. Each has two rolled edges. 8 has a punched hole and broke from hole outward. 9 has a reamed hole and did not crack at all. Specimens 10
. Proceedings of the annual convention . 223 224 PROCEEDINGS OF THE Specimens I to 5 all have both edges rolled. I and 2 were cut about 1-32-inch deep across one face with a coldchisel and broke as shown at first treatment. 3 to 5 were not cut and stood one, two and three treatments, respec-tively, without cracking. Specimens 6 and 7. 6 has two sheared edges and cracked from the rougher edge. 7 has two ground edges and did not crack at all. Specimens 8 and 9. Each has two rolled edges. 8 has a punched hole and broke from hole outward. 9 has a reamed hole and did not crack at all. Specimens 10 and 11. Each has two rolled edges. 10 has two punched holes and broke at the first treatment. II has two reamed holes and was fractured as shown. Specimens 12 and 13. 12 has two sheared edges and a punched hole. It broke at the firsttreatment. 13 has two ground edges and a reamed hole. It was fractured asshown, due mainly to the thickness of the plate. Specimens 14 to 19 were long enough so that the two ends could betreated separately,
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