e. The doors swing on hinges and are built up of 2 by 7 inch oak beams 4£ feet long and spaced 7 inches between centers, the outside being covered with Hnch soft wood loosely held with headless nails and covered over with air-proof roofing paper. This construction was adopted as a safeguard against… … /wart covered with a very heavy coating of asphalt paint and the doors close against heavy rubber gaskets. The engine is mounted at the right end of the test chamber, figure 1. The walls of the chamber are pierced, by a number of holes appro- priately placed, each being provided with a flange and…
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