2 Engineering News Record, Oct. 1925. 8, 15.22.29) 6.13.20. 227) 3.10.47 24.31| 7 44.21.2817. 14.21 2814. tf 18.2512. 9. 16.23.30)6. 13.20.27) 4.41 18.25) 1. 8. 15.22.29) 5. 12.19. 26| 3.10.17 2431. e SMOKE, AND SMOKE PREVENTION 56r tent of air damping is applied to four standard malig- nant growths with more