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1-3/8 in. thick. Hangers used with the track are fitted with nylon wheels and are first screwed to the top inside face of each door panel then hooked on to the appropriate track.
The specially-designed track pro- file, in addition to giving a smooth running surface, ensures that the hang ers cannot jump off the rail in the normal vertical operating position; while nylon guides, fastened down to the floor in the centre of the door opening, secure the bottom edges of the door panels. In each installation, the gap between the top of the door and the underside of the soffit mea- sures 1-3/8 in.
The makers are Hillaldam Coburn Ltd.. Red Lion Road, Surbiton, Surrey, UK. Agents in Hong Kong are Wing Heng Trading Co.
RADIO TELEPHONE
Latest addition to the Pye Pocket- phone 70 series, the PF2FMB radio- telephone, works in conjuction with three-channel communication in the 68- to 80- MHx, and 148- to 174- MHz. VHF bands. A lightweight com- bined transmitter/receiver unit, suit- able for emergency, public and private use, it runs off a rechargeable 15-v. nickel-cadmium battery and has an approximate operating range of 3 to 5 miles, depending on local conditions.
The solid-state transmitter and receiver sections of the PF2FMB unit are built on to the same chassis and housed, together with the battery, in strong, weatherproof polycarbonate case measuring 7 in. long by 34 in. wide by 14 in. thick for a total weight of only 1 lb. 12 oz. Sockets on top of
PF2FMB radio-telephone
the case make connection with a small external loudspeaker/microphone and an antenna, and the whole unit can be clipped to a waist belt or carried in a specially-designed leather case.
It can also be carried in an inside
coat pocket, if required, with the loud- speaker/microphone clipped to the
lapel.
The unit is suitable, when fitted with an adaptor, for use in a car or other vehicle. Its battery has a 200- mah. capacity for an approximate operating time of 20 hr. per charge, and although the unit remains on to receive calls all the time, an integral economy circuit minimises battery drain when signals are neither being received nor sent.
The makers are Pye of Cambridge Ltd., Cambridge, UK. Agents include: Gilman & Co. Ltd., Hong Kong; O'Connors (Pte) Ltd., Singapore; and Vichen Pathana Ltd., Bangkok.
DISPLAY LIGHTING
Two new projectors, the Dis- comatic and the Discomajor, direct light through rotating liquid-filled wheels to provide multi-coloured moving patterns.
The liquid discs consist of a sand- wich of three glass plates, forming two
DISCOMATIC PROJECTOR
Discomatic
Discomajor
separate cells into which are sealed different-coloured liquids. These liquids will not mix or dry up, and when the wheel is rotated they flow into various shapes to form constantly changing patterns.
Each projector has a built-in elec- tric motor to power the wheel and this completes one revolution every two minutes. Inter-changeable discs are simply screwed to the motor spindle.
Both aluminium-bodied projectors incorporate an 85 mm lens and turbo fans for cooling. The 150w. Dis- fans for cooling. The 150w. Dis
comatic measures 11 in. long by 8 in. square, while the 250w. Discomajor measures 18 in. long by 8 in high by 6 in, wide.
The makers are Lightomation Ltd., South Hill Lodge, South Hill Avenue, Harrow, UK.
SURVEYING INSTRUMENT
A portable laser-beam projector named the Laserline has been develop- ed for use in all types of construction and civil engineering work. It is a safe
Laserline
device which gives a visible reference line for construction by projecting a beam of red light that can be picked up with a reflector, even in sunlight.
Operating from a battery the Laser- line contains a 1 mW helium neon light source which produces a pin-point beam that is expanded to a diameter of 15 mm and focussed to a parallel beam by a precision optical lens system integral with the laser unit, a feature said to improve rigidity and reduce warm-up drift. The beam has a range of up to 4-mile and is unaffect- ed by the passage of vehicles. Once set up it can be left unattended. It can stand up to the same conditions as a normal theodolite.
The instrument has a telescopic aiming sight mounted on top of the aluminium main housing which mea- sures 2 ft. 4 in. by 31⁄2 in. and weighs 15 lb. 6 oz.
The makers are Elliott Automation Radar Systems Ltd., Airport Works, Rochester, Kent, UK.
GLOSS EMULSION
A British firm, A. Sanderson & Co. Ltd., Kingston Paint Works, Hull, has developed a water-based gloss emul- sion which is said to be the equal of oil-based alkyd gloss paints in its high gloss finish, water resistance and dura- bility. Based on a new copolymer, it is suitable for all general work inside and outside where normal gloss finishes would be used.
It becomes touch dry in an hour and hard dry in three hours. Drying is by water evaporation.
Far East BUILDER, January 1971
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