Abstract: An explosive-containing casing is provided with a cap to which a nipple is secured. The nipple supports a rigid rod which extends the length of the casing and which in turn supports a detonation train for the explosives within the casing. An electrical connector arrangement is joined to the nipple to permit a conductive path to be established to a detonator which forms part of the detonation train. The nipple is secured to the cap in a manner which prevents the entry of water or other undesirable substances into the casing.

Abstract: A sun tracking system having at least one photo-sensor for each tracking axis, wherein a small inclined mirror, blackened except for a small reflective aperture, reflects a spot of light on a predetermined surface fixed with respect to the mirror. The position of the spot on the surface is in accordance with the relative alignment of the mirror to the sun. A photo-sensor associated with a given axis is disposed on the surface at a position corresponding to the desired alignment of the device to the sun. A further photo-sensitive device can be disposed in close proximity to the first photo-sensor to effect positive activation of a motor to correct misalignment, illumination of the first photo-sensor inhibiting the motor and for compensating for changes in ambient light. A simple transistor-relay circuit for effecting correction of alignment is also disclosed.

Abstract: A flashlight assembly including a flashlight bulb and an accessory device, such as a two-way wireless radio, operated by the same rechargeable battery. Recharging circuitry provides for sure, ready recharging of the battery, and low-current drain flashing circuitry provides for long flashing life for a given battery charge. All of the components are mounted in a casing, the casing having a handle affixed thereto for facilitating ready manipulation and utilization of the flashlight bulb and accessory device.

Abstract: A remote alarm monitoring and control circuit control system for centralized monitoring of areas remote from the monitoring location. The system comprises a centrally located monitoring board connected via conventional phone lines to a plurality of remotely located control boxes each in turn being connected to a number of individual sensor inputs. Each of the control boxes is capable of sending two different and distinguishable signals via one telephone line connected to the monitoring board. Further, the system at the remotely located control boxes can be reset from the monitoring board without the need for gaining entry to the location where the remotely located control box is placed.

Abstract: A device for normally supplying electrical power from a power source to an electrical device having a working portion which may come into contact with a grounded metal object during its operation and for automatically interrupting such power supply to the device whenever the working portion of the device actually does contact the grounded metal object.