Snyder v. Bunnell

The defendants are charged with infringement of letters patent No. 103,383, granted to James P. Snyder for an improvement in electro-magnetic burglar-alarm apparatus. The invention "consists in an arrangement for setting in action automatically a secondary circuit, which will continue the alarm, although the circuit first sot in action may be suddenly stopped again by the shutting of the door or window.” The claim is as follows:

“A'n alarm indicator, arranged for automatically causing a secondary and independent circuit at the indicators by the action of the armature lever with a disk or other…