Which inventor designed a sprinkler with a glass ball held against an open pipe by a double arm lever arrangement held in place by fusible solder?

Which inventor designed a sprinkler with a glass ball held against an open pipe by a double arm lever arrangement held in place by fusible solder?

• A. Marcus Ruthenberg
• B. Ambrose Godfey
• C. John Kane
• D. Major Harrison

Answer: (A)

This design tests understanding of early heat-activated sprinklers and how a mechanical latch works with a fusible element. The glass ball acts as the heat-sensitive part of the device. It is pressed against an open pipe and held there by a double-arm lever arrangement that is stabilized with fusible solder. When the temperature reaches the rated point, the solder melts (or the bulb’s liquid expands enough to break it), releasing the lever. Once released, the lever no longer holds the glass ball in place, allowing the valve or passage to open and water to be discharged through the sprinkler. That specific combination—the glass ball against the open pipe, the double-arm lever, and fusible solder as the holding mechanism—is associated with Marcus Ruthenberg as the inventor. The other names are not known for this particular configuration, as they are linked to different sprinkler designs or mechanisms.

This design tests understanding of early heat-activated sprinklers and how a mechanical latch works with a fusible element. The glass ball acts as the heat-sensitive part of the device. It is pressed against an open pipe and held there by a double-arm lever arrangement that is stabilized with fusible solder. When the temperature reaches the rated point, the solder melts (or the bulb’s liquid expands enough to break it), releasing the lever. Once released, the lever no longer holds the glass ball in place, allowing the valve or passage to open and water to be discharged through the sprinkler.

That specific combination—the glass ball against the open pipe, the double-arm lever, and fusible solder as the holding mechanism—is associated with Marcus Ruthenberg as the inventor. The other names are not known for this particular configuration, as they are linked to different sprinkler designs or mechanisms.