Abstract: A motor bell alarm comprises an electric motor and a linkage by which the rotational motion generated by an electric motor is translated to a longitudinal oscillating motion so as to cause a plunger coupled to the linkage to cyclically strike a shell, thereby creating a ringing sound. The volume and clarity of the ringing sound are enhanced by minimizing the time in which the plunger is in contact with the shell and by minimizing the rest mass that is in contact with the shell as it is struck by interposing a lost-motion connection between the plunger and the linkage to the electric motor, whereby upon and after striking the shell the plunger is mechanically uncoupled from the lever.

Abstract: Surgical and dental apparatus may be sterilized after implantation in the patient and caused to provide bactericidal effects in the tissue proximate to the apparatus. The apparatus contains silver or is silver coated. A positive current is applied to the apparatus which releases atomic silver into the volume surrounding the apparatus.

Abstract: An electrode for use in low intensity direct current therapy of skin lesions and the like. The electrode contains silver from which silver ions are carried to the treatment site under the influence of direct current to provide a germicidal action at the lesion. The electrode may have a porous support structure and some of the silver may be chlorided. The electrode is maintaned in substantially direct contact with the treatment site while being saturated with an electrolyte similar to tissue fluids.