Abstract: The present invention concerns a hydrophone signal limiting shunt switch, electrically associated and physically conjoined with a conventional hydrophone, for limiting hydrophone signal operability to water depths less than a predetermined, proscribed depth. The primary components of the shunt switch are a protected plunging bolt, at least one disk spring and an electrically conducting foot, none of which are ever in direct contact with the ocean environment. Flexure of the disk spring is the sole determinant of switch actuation. Upon sensing a predetermined, proscribed operating depth, the protected plunging bolt forces the electrically conducting foot to shunt the electrical connection between the associated hydrophone and the hydrophone transmission cable, consequently, quenching the hydrophone signal at the proscribed depth.

Abstract: The present invention concerns a hydrophone signal limiting shunt switch, electrically associated and physically conjoined with a conventional hydrophone, for limiting hydrophone signal operability to water depths less than a predetermined, proscribed depth. The primary components of the shunt switch are a protected plunging bolt, at least one disk spring and an electrically conducting foot, none of which are ever in direct contact with the ocean environment. Flexure of the disk spring is the sole determinant of switch actuation. Upon sensing a predetermined, proscribed operating depth, the protected plunging bolt forces the electrically conducting foot to shunt the electrical connection between the associated hydrophone and the hydrophone transmission cable, consequently, quenching the hydrophone signal at the proscribed depth.

Abstract: A smoking device is provided which includes a base having compartments for holding tobacco or the like and a lighter. At one end of the base is a rotatable, longitudinally extending and hollow burning chamber having an elongated longitudinal opening in one side thereof and having relatively small orifices in either end. A lighter is positioned in one of the compartments of the base so that its flame when lit, extends adjacent one of the orifices in the burning chamber. The other orifice in the chamber has located proximal thereto, a rotatable smoking stem provided with an orifice which may be aligned with the chamber orifice by appropriate rotation of the smoking stem. Further rotation of the stem disengages its orifice from alignment with the chamber orifice and locates the stem in a storage compartment in the base. The rotatable burning chamber may be rotated about its longitudinal axis so as to align the elongated opening therein with the tobacco compartment for loading the chamber.