| 摘要 |
Apparatus for applying a fluctuating stress to, for example, a gable end (9) of a house includes means (6, 7) for defining with the end (9) a pressure enclosure. Air compression means (1) are connected to the pressure enclosure via a series of gauged valves (19) (20) whose position are continuously variable between limiting positions where the air compression means supplies all its output to, or takes all its output from the pressure enclosure. The effects of gusty winds can thus be simulated. |
