Memories of Brown; traditions and recollections gathered from many sources . acuus essem. Quoniam eotempore apud meam scholam semper occupatus sum, voscrastino die nona hora (vel Anglice) tertia post meridiemhora, conveniam. Valete, J. L. ix. Kal. Jul. MDCCCLXHL The personality of Professor Caswell made a verystrong impression on me. As a teacher of science and asa performer of scientific experiments, indeed, he was notto be compared with Chace. Critical experiments oftenfailed, and the principle they illustrated had to be takenfor granted. I recall one occasion on which, in
Memories of Brown; traditions and recollections gathered from many sources . acuus essem. Quoniam eotempore apud meam scholam semper occupatus sum, voscrastino die nona hora (vel Anglice) tertia post meridiemhora, conveniam. Valete, J. L. ix. Kal. Jul. MDCCCLXHL The personality of Professor Caswell made a verystrong impression on me. As a teacher of science and asa performer of scientific experiments, indeed, he was notto be compared with Chace. Critical experiments oftenfailed, and the principle they illustrated had to be takenfor granted. I recall one occasion on which, in order togive ocular demonstration of the rotation of the earth onits axis. Professor Caswell had suspended a cannonballby a wire from a hook in the ceiling, that it might swing 226 Memories of Brown as a pendulum from the point of support, and had drawna chalk line on the floor to mark the line of oscillationwhich the cannonball would take when set swinging atthe beginning of the recitation hour. At the close of therecitation hour, the plane of oscillation having remained. Theodore M. Hob:gand Instructor in French 1863-72 (Taken about 1869), constant, the deflection of the line of oscillation wouldgive ocular evidence of the intervening rotation of theearth. At the beginning of the experiment, the cannon-ball was held fast by a string at one extremity of the arcof vibration, and Professor Caswell, in order to prevent allpossibility of jar, proceeded to burn the string instead ofcutting it. We were all watching with eagerness and ex-pectancy, when suddenly the wire by which the ball was Memories of Brown 227 suspended broke, and the ball rolled ignominiously overthe floor with a clatter and bang almost as loud and dis-concerting as the applause of the students which followed. Professor Caswell had a smile which expressed pure benignity. One day, , a classmate of mine, failed on a scholium in geometry, and, by way of explanation of hisfailure, said that he had read the scholium c
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