Abstract: A safety helmet for a bicyclist combined with a miniature public address (PA) system which makes it possible for the riding bicyclist to broadcast to those who are in the hearing range of the system. The helmet which is formed from an outer shell having a cushioning inner liner has extending therefrom a gooseneck supporting a microphone at a position adjacent the mouth of the bicyclist wearing the helmet. The microphone is connected by a line passing through the gooseneck and extending behind the helmet to a compact amplifier and loud speaker unit clipped onto the waist belt of the bicyclist. Power for the unit is supplied by a battery power back, included in the unit or incorporated in the frame of the bicycle.

Abstract: A partially lined disc brake of a compact and simple design with a brake capacity variable over a wide range and characterized by braking reliability of a high order is suitable for use both with a single brake caliper and with a double brake caliper. The partially lined disc brake is characterized by virtue of the use of a single release unit only, offset outwards in the brake disc plane, by a simple, trouble free drive for closing and opening the brake calipers, and a reliable brake-lining wear-compensation device.

Abstract: A line securing or fastening device having a base, a neck tapering upwardly from the base and a generally arcuate knob portion on top of the neck and two transverse wedge-shaped channel openings through the principal axis passing through the device and the channels separating the neck and knob into four segments or posts open at the top and adapted to be firmly secured to a structure such as a hull or deck so as to provide an easy means of adjustably securing lines, such as mooring lines and admitting of quick release from the fastening device.

Abstract: Retractable auxiliary and emergency propulsion device for small craft comprising a hydraulic motor with its own propellor, powered by a hydraulic pump applied either to a motor installed on the craft just for this purpose and of considerably reduced power compared to the principle motor or to other motors already on the boat for other purposes, such as, for generators, refrigerators, compressors and the like the hydraulic motor sliding on inclined guides placed in the stern of the craft so as to be dropped into the sea when necessary, or raised up and placed in a suitable storage space in the boat.

Abstract: An arrangement for mounting a cycloidal propeller is disclosed which has elastic support rings and elastic thrust rings. At least the elastic thrust rings are clamped between two frustoconical surfaces which are substantially parallel to each other. One surface is on a ring attached to the propeller base plate and the other is on a ring attached to the propeller foundation. The position of the rings may be changed to adjust the natural frequency of the mounting, for better damping of the forces from the propeller. The elastic support rings are preferably also clamped between parallel frustoconical surfaces. The angle of inclination of all the frustoconical surfaces in relation to the plane of the propeller base plate is between 32.degree.-38.degree..

Abstract: A microprocessor system having at least two separate large scale integration devices. A first of the two large scale integration devices is a central processing unit formed on a single semiconductor die, and the second large scale integration device is a memory circuit formed on a separate single semiconductor die. The term "die" as used herein is conventional and refers to a unitary semiconductor body or chip. The central processing unit requires an external program counter which contains memory addresses of instruction codes to be used by the central processing unit. The memory device is electrically coupled to the central processing unit and includes a memory for storing the instruction codes, and a program counter for addressing the memory. Provision is made to incorporate additional memory circuits to expand the size and capability of the microprocessor system. System interrupt circuitry is also provided for interrupting system operation to change to a new sequence of instruction codes.