Abstract: Disclosed is a passive headset apparatus for directing sound coming from the front of a user into the user's ear and its external auditory canal without the use of batteries, speakers or electronics. In particular, it directs high frequency sound of about 500 Hz and up, directly into the canal, improving clarity for loss of hearing while shielding and muting sound from the sides of the ears. The external auditory canal follows two compound angles leading into the skull. This invention focuses sound into the angles of the external auditory canal using sound deflectors configured to direct sound at the correct angles.

Abstract: A silver recovery system includes a novel power supply and a novel structure for a cell used in the recovery system. The power supply monitors the conductivity of the electrolyte of the silver recovery system and automatically sets power to the operating or standby modes depending on the magnitude of the conductivity. Thus, the system is capable of unattended operation. The cell consists of a canister which is a hollow cylinder having an open top end and a closed bottom end. The anode is an elongated rod and extends into the canister centrally thereof, and the cathode is a partial cylinder which surrounds the anode.