from The Century Dictionary and Cyclopedia
- n. A special form of force-pump combined with a pressuregage for testing the strength of boilers, tubes, etc., by means of water-pressure.
Sorry, no etymologies found.
When the hose are completely finished in this manner they are proved by a proving-pump, and if they stand a pressure of two hundred feet of water they are considered fit for service.
The method of proving by an engine is considerably better than this; but when a proving-pump can be obtained it is infinitely better than either.