Abstract: A switch construction for use on an illuminated article worn by a user which closes a circuit providing current to an illumination source only upon the occurrence of acceleration reacting to motions of the user while at the same time limiting the amount of time the illumination source is operative, and preventing accidental continuous operation of the illumination source while the device is not in use or the body of the wearer is motionless. The switch is not gravity sensitive, and can operate in any position on the body of the wearer.

Abstract: This invention relates to electric or electronic musical instruments for the production of audible musical composition ranging from quite simple to very complex arrangements. More particularly this invention is a device for the creation and editing of a musical work produced by the composer or arranger and which enables the immediate rehearsal of the fully or partially completed musical arrangement.The device is designed to be connected to an electronic musical instrument which replays the recorded composition. Such an instrument, for example, can be an electronic organ and/or an electronic musical synthesizer which accordingly either incorporates or is connected to the device.

Abstract: The sprocket assembly for periodic advancement of film in a film projector is supported axially between rotated members and is corotative with the members upon increase in axial force therebetween. One of the members is axially restrained and the second member supported for minute axial movement. Force giving rise to the corotation of the members and sprocket assembly is applied to the second member by selective movement of a magnetically attractable element into a magnetic field generated continuously during projector use.

Abstract: The sprocket assembly for periodic advancement of film in a film projector is supported axially between rotated members and is corotative with the members upon increase in axial force therebetween. One of the members is axially restrained and the second member supported for minute axial movement. Force giving rise to the corotation of the members and sprocket assembly is applied to the second member by selective energization of an electromagnet.

Abstract: Timing apparatus comprising a housing having a fluid-containing conduit and a body movable in the conduit under the influence of gravity includes a valve for controlling circulation of fluid in the conduit and thereby controlling the time elapsed during movement of the body between preselected locations. The housing supports a magnet for sliding movement when the body descends to its lowermost location and a member responsive to such magnet movement initiates audible output indication.