slight motion of the air from an external source. Opening a door at one end of the warehouse room, although, as before stated, these doors did not open outdoors, made a decided difference, and if a strong wind was blowing outside, the radiator to the windward side had some advantage, although no draft would be perceptible. However, with due care, the two tests for each comparison were made to check with fair accuracy.
Fig. 23 Front Elevation of Testing Rooms.
Fig. 24 Plan of Testing Rooms.
Fig. 25 Elevation of Piping. Radiator Tests.
