Acoustics of Auditoriums (Classic Reprint) - Softcover

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Excerpt from Acoustics of Auditoriums

Eighteen tests made on selected sections of tangent track are described. The track upon which the tests were made is of good con struction, such as one would expect to find on the better grade of inter urban electric railways. The weather during the tests was generally fair. The average temperature was not below 25° F., and the wind velocity did not exceed 26 miles per hour. The test car used is described in detail in Appendix I.

The general plan was to run the test car backward and forward over the chosen track section at a variety of speeds, but maintaining approximately the same constant speed during each pair of opposing runs. The tests comprise in all 269 resistance determinations of which 131 have been calculated from runs during which the wind opposed the motion of the car, 130 from runs during which the wind helped the car, and 8 from runs made when no wind was blowing. During the two tests of group A, comprising 45 resistance determinations, opposing runs have been separated by a considerable time interval during which wind and weather conditions might change; but through changes made in the method of making the tests, opposing runs for the remaining tests have been separated by a small time interval.

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