Abstract: A method of producing part of an aircraft comprising: providing a frame having a first surface, a second surface, and one or more side edges between the first and second surfaces; mounting the frame to a first tool, the first tool comprising a support surface that contacts the second surface of the frame to opposing movement of the frame; while the frame is mounted to the first tool, machining the first surface to form attachment features; mounting the machined frame to a second tool which contacts with the frame at only the one or more side edges; and, while the frame is mounted to the second tool, attaching, using the attachment features, to the first and second surfaces, aircraft panels to form an outer skin.

Abstract: A method of producing part of an aircraft comprising: providing a frame having a first surface, a second surface, and one or more side edges between the first and second surfaces; mounting the frame to a first tool, the first tool comprising a support surface that contacts the second surface of the frame to opposing movement of the frame; while the frame is mounted to the first tool, machining the first surface to form attachment features; mounting the machined frame to a second tool which contacts with the frame at only the one or more side edges; and, while the frame is mounted to the second tool, attaching, using the attachment features, to the first and second surfaces, aircraft panels to form an outer skin.

Abstract: The disconnection mechanism 116 is disclosed to disconnect solar cells 5, 105 from high voltage DC cables 13, 113 which may run through the interior of a building 1 and thus represent a hazard to emergency service personnel such as firemen attending a fire in daylight hours. Thus the DC output from the cells 5, 105 can be rendered safe. The mechanism is located in an elevated position adjacent the solar cells 5, 105 but is operable by an elongated actuator 19, 119 which extends to ground level. Preferably the solar cells are individually connected via corresponding cables 223 to a terminal block 118 within a fireproof housing 117 for the disconnect mechanism 116.

Abstract: The present invention provides an optical apparatus including an objective lens system for focusing optical radiation from a scene or object into an intermediate image and has at least one lens element which imposes a substantial degree of negative distortion on the intermediate image. The invention also provides a second lens system for focusing optical radiation from the intermediate image into a final image and an aperture stop for limiting the optical radiation forming the final image. The aperture stop is located between the final image region in which the final image is formed or to be formed and the lens element of the second lens system most distant from the final image region.

Abstract: A dual field-of-view objective system (40) which is inexpensive, has high transmission and is essentially achromatized and athermalized. The system (40) uses a silicon front lens A and all lens elements have positive temperature/refractive index change coefficient.

Abstract: A low voltage, electrically actuated, nonprimary explosive detonator is disclosed wherein said detonation is achieved by means of an explosive train in which a deflagration-to-detonation transition is made to occur. The explosive train is confined within a cylindrical body and positioned adjacent to low voltage ignition means have electrical leads extending outwardly from the cylindrical confining body. Application of a low voltage current to the electrical leads ignites a self-sustained deflagration in a donor portion of the explosive train which then is made to undergo a transition to detonation further down the train.