Airplaneengine and propeller test-cell lighting

F. C. Somers (nonmember; Scotch Plains, N. J.): Mr. Tuck´s paper, in stressing the importance of co-ordinating the brightness of the control-room and test-cell lighting, underlines the fundamental cause of many of the existing unsatisfactory lighting installations. Many test cells, having good lighting in the control room and test cell considered separately, have failed under conditions requiring the engine to be viewed through multipaned glass observation windows.