Rogers, E. E.. 23 Wilton Crescent, Wimbledon: Electric Alarm Signal for Use at Sea. EP. 8044 of 1911. (Is operated by alternating current and comprises a buzzer, indicator and contact push arranged in a watertight box. The passage of electric current operates the buzzer and simultaneously releases the indicator which remains visible until reset by hand. All in a watertight ... (A fly-wheel spring and cable for retarding the action of an electro-magnet as in railroad signals.) Howard, L. F.anbsp;...