Abstract: Method and apparatus for use in a floating vessel subjected to wave action, used to determine the proper vessel heading so that the longitudinal axis of the vessel will be positioned parallel to the direction of oncoming waves, thereby reducing the risk of capsizing of the vessel. The apparatus comprises a mass elastically suspended from a portion of the vessel structure. Observation of the direction of rotation of the mass allows the helmsman to determine what direction to steer the vessel so that the vessel remains headed into the waves.

Abstract: This troll meter is used to determine the speed of a boat in the range of one to three knots. Primarily, it consists of a shaft having three marked and different pitched propellers, which are rotated by the forward speed of the boat, and each is freely and rotatably received on shaft 11.

Abstract: A temperature detecting device having rapid temperature sensing characteristics and with a fully protected temperature sensitive element. A transistor pellet potted in a resin casing having at least one thin wall is mounted in a metal protective tube in thermal contact provided through a small amount of filler material of high thermal conductivity. A heat collector is disposed around the protective metal tube in close thermal contact therewith. The edges of the heat collector are held in position against ribs formed on an insulating casing by engaging members of a protective ring which fit into corresponding notches formed in the upper portion of the ribs. Protrusions formed on the protective member prevent its rotation and removal hence making the device essentially tamperproof.