Abstract: Electronic slot machine system comprises a central computer unit, and a plurality of portable game units, each including a credit memory for storing a predetermined credit available for playing, a manual operator manipulatable by the player for playing the game according to a predetermined amount, a computer for determining any winnings earned by playing the game and for updating the credit memory by the predetermined amount played and by any such winnings, and a display for displaying the results of the game played, the earnings if any, and the current amount in the credit memory. The central computer unit may be coupled to a selected one of the portable playing units to credit the memory of the coupled portable game unit with the predetermined credit available for playing, and to read out the current amount in the credit memory of the coupled portable game unit.

Abstract: An optical device comprising a monocular assembly including an objective lens to be located remote from the viewer's eye for viewing a scene, and a cathode ray tube and prism assembly for injecting additional information into the viewed scene. The prism assembly is adjacent to and aligned with the objective lens and comprises a pair of transparent prisms having confronting inclined surfaces joined together at their inclined surfaces, and a reflector sandwiched between the joined inclined surfaces and having a surface area which is from 0.5% to 5.0% of the surface area of the objective lens.

Abstract: An optical viewing instrument, comprises a housing including an eyepiece for viewing a field; a beam splitter within the housing and splitting the field viewed via the eyepiece into a first image for direct viewing by a first observer, and a second image for viewing by a second observer; and a solid state image converter within the housing located to receive the second image and to convert it to electrical signals for reproduction at a remote location.

Abstract: An image converter system comprises an image sensor producing an electrical signal corresponding to the sensed light intensity; a change-in-position sensor physically coupled to the image sensor so as to be moved therewith and to produce output signals corresponding to the changes in position of the image sensor; and a control cirucit for shifting the electrical signals produced by the image sensor according to the changes in position of the image sensor as sensed by the change-in-position sensor, to compensate for the changes in position and thereby to position-stabilize the electrical output of the image sensor.

Abstract: An electronic magnetic compass for computing the magnetic heading of a vehicle, such as a tank, having two iron bodies relatively movable with respect to each other about a vertical rotary axis comprises: a non-pendulous triaxial magnetometer outputting magnetic field electrical signals representing the three axial components of the magnetic field at the location of the magnetometer; sensors outputting electrical signals representing the pitch and roll of the vehicle body on which the sensors are mounted; an angle measuring device for outputting electrical signals corresponding to the angle of rotation between the two bodies; a memory for storing a plurality of pre-calibrated correction factors for correcting the effects of the permanent magnetic field and the induced magnetic field on the measurements of the magnetometer for each of a plurality of angles of rotation between the two bodies; and an electronic computer for computing on a real-time basis the magnetic heading of both bodies from the magnetic fiel

Abstract: An optical sighting device for a rifle or other article to be aimed at a target includes a frame for mounting to the rifle and a very short sighting window atop the frame. A light source in the frame powered by a battery shines a beam of light toward the sighting window which incorporates a retro-collimating beam-splitter so that the marksman sees in the window an image of the reticle in the form of a spot of light superimposed on the target image. When he moves the rifle to place the reticle image at a selected spot on the target image and fires the rifle, the bullets leaving the rifle will strike that spot on the actual target. The sighting device also includes means for adjusting the position of the reticle to compensate for the effects of gravity and wind on the bullets and means for adjusting the relative intensity of the reticle and target images to suit the marksmans preference and to compensate for changes in the ambient light in the vicinity of the sighting device.

Abstract: An antenna for communication sets on military vehicles is provided which is interchangeable with existing military antennae, and is suitable to operate with the VRL-12 family. It is adequate to an input impedance of 50 ohm nominally, operates in the frequency band of 30-76 MHZ and is thus suitable for all communication sets operating in this frequency band. It accommodates transmitter power of 100 watts.The coupler is made of armoured steel and the whip is shorter and thinner than that of prior units. It is made of such materials which make it a more rugged and less vulnerable in the battle field.