Abstract: In order to provide a zip closure system that is difficult for a thief to operate, the system comprises a first zip slider (40), capable of fastening and unfastening the teeth, of a zip closure, and at least one of a second zip slider (41) and an end of a zip closure, the first zip slider (40) having a first handle (43) and the second zip slider (41) having a second handle (45), the handles (44,45) being configured so that when the first slider (40) is adjacent to the second slider (41), the first handle (43) overlies the second slider (41) and the second handle (45) overlies the first slider (40). The first and second handles (43, 45) can be released by moving right or left. A range of products can be provided which operate according to the same principles, but in which the first movement, for example left or right, varies between different products of the range.

Abstract: An ROV comprising a topside, a fish and an umbilical cable for connecting the topside and the fish together. The fish is adapted to be powered by an onboard battery inductively coupled to the fish. The cable is of a fine diameter to reduce drag through the water. RF transmissions carry control and return signals to and from the fish and topside. The fish has two cameras. The front facing camera is located behind a dual layer flooded dome. A pan and tilt mechanism is fitted to one of the cameras and uses a pivotable gimbal frame driven by a lead nut moving along an arcuate bolt.

Abstract: An ROV comprising a topside, a fish and an umbilical cable for connecting the topside and the fish together. The fish is adapted to be powered by an onboard battery inductively coupled to the fish. The cable is of a fine diameter to reduce drag through the water. RF transmissions carry control and return signals to and from the fish and topside. The fish has two cameras. The front facing camera is located behind a dual layer flooded dome. A pan and tilt mechanism is fitted to one of the cameras and uses a pivotable gimbal frame driven by a lead nut moving along an arcuate bolt.

Abstract: A lighting system (1) comprises a plurality of high intensity discharge lamps (9, 39, 6) and an electronic control (2) having a power input (4), an alternating current power output regulator (22), and an alternating power output (3) having an output frequency arranged to be variable within an output frequency range, the output having a first and a second output line. The lamps are connected in series with each other so that the first line is connected to the first electrode (11) of the first of the lamps, the second electrode (12) of the first of the lamps is connected to the first electrode (41) of the next lamp in the series, the second electrode (13) of the final lamp in the series being connected to the second output line. The lamps have an acoustic resonant frequency range and the output frequency range of the control is arranged to be above the acoustic resonant frequency range.

Abstract: An ROV comprising a topside, a fish and an umbilical cable for connecting the topside and the fish together. The fish is adapted to be powered by an onboard battery inductively coupled to the fish. The cable is of a fine diameter to reduce drag through the water. RF transmissions carry control and return signals to and from the fish and topside. The fish has two cameras. The front facing camera is located behind a dual layer flooded dome. A pan and tilt mechanism is fitted to one of the cameras and uses a pivotable gimbal frame driven by a lead nut moving along an arcuate bolt.

Abstract: An ROV comprising a topside, a fish and an umbilical cable for connecting the topside and the fish together. The fish is adapted to be powered by an onboard battery inductively coupled to the fish. The cable is of a fine diameter to reduce drag through the water. RF transmissions carry control and return signals to and from the fish and topside. The fish has two cameras. The front facing camera is located behind a dual layer flooded dome. A pan and tilt mechanism is fitted to one of the cameras and uses a pivotable gimbal frame driven by a lead nut moving along an arcuate bolt.

Abstract: A lighting system (1) having a high intensity discharge lamp (16) mounted replaceably in a holder (25) which connects to an electronic control (8) which includes a variable frequency generator (10), a joint operating circuit extends from the lamp to the control; the control is arranged to sweep over a predetermined range of frequencies to produce by means of a resonant circuit which includes in the circuit (22) capacitance (12, 13, 21) which is at least partly in or on the lamp. Removal of the lamp from the system prevents the production of the resonant high voltage ensuring improved safety.

Abstract: A lighting system (1) comprises a plurality of high intensity discharge lamps (9, 39, 6) and an electronic control (2) having a power input (4), an alternating current power output regulator (22), and an alternating power output (3) having an output frequency arranged to be variable within an output frequency range, the output having a first and a second output line. The lamps are connected in series with each other so that the first line is connected to the first electrode (11) of the first of the lamps, the second electrode (12) of the first of the lamps is connected to the first electrode (41) of the next lamp in the series, the second electrode (13) of the final lamp in the series being connected to the second output line. The lamps have an acoustic resonant frequency range and the output frequency range of the control is arranged to be above the acoustic resonant frequency range.

Abstract: An electronic control (1) for a discharge lamp (D), which is arranged to be connected to a source of alternating current (L,N), having a source frequency, the control having a first and second terminal (J,K) for supplying an electrical power output to operate the lamp; a capacitor (T) is in series with the first terminal, having a capacitance sufficiently small to limit a current flow from the first terminal at the source frequency of less than 30 mA.

Abstract: A lighting system (1) having a high intensity discharge lamp (16) and an electronic ballast having a variable frequency generator (10) which is arranged to vary the frequency of the ballast output over a range of frequencies having a minimum frequency of 400 kHz; a reactance is included in a joint operating circuit (22) in and between the ballast generator (10) and lamp (16) such that the circuit resonate to provide a starting voltage for the lamp at or above the minimum frequency. The arrangement inhibits lamp flickering and improves overall lamp and system efficiency.

Abstract: An ROV comprising a topside, a fish and an umbilical cable for connecting the topside and the fish together. The fish is adapted to be powered by an onboard battery inductively coupled to the fish. The cable is of a fine diameter to reduce drag through the water. RF transmissions carry control and return signals to and from the fish and topside. The fish has two cameras. The front facing camera is located behind a dual layer flooded dome. A pan and tilt mechanism is fitted to one of the cameras and uses a pivotable gimbal frame driven by a lead nut moving along an arcuate bolt.