Manufactured byU.S. Rare early 20th-centuryCentral Automatic Sprinkler Co. (Philadelphia) brass fire-protection gauge. Unlike common WATER gauges, thisAIR model was used on dry-pipe sprinkler systems to monitor compressed air pressure.
Manufactured byU.S. Rare early 20th-centuryCentral Automatic Sprinkler Co. (Philadelphia) brass fire-protection gauge. Unlike common WATER gauges, thisAIR model was used on dry-pipe sprinkler systems to monitor compressed air pressure.