No_10_October_1968 — Page 48

corrected for incident light measure- ment from 2.0 lux to 10,000 lux.

For normal work the subject is viewed through the telescope of the instrument and the small circle visible in the centre of the field of view is made to coincide with that part of the scene of which the luminance is to be given.

642

Pan-Air purifying unit

Power for the extractor derives from a 6 v d.c. motor developing 4,000 r.p.m. and operated by four 11⁄2 v bat- teries; it drives a 20-blade tangential fan that produces an air flow of 15 cu. ft. (0.425 cu. m.) per min. The slide-in, perforated-metal filter carries a bed of 6-14 mesh activated carbon that ab- sorbs odours and should need replace- ment only at approximately 6-month intervals.

PHOTOMETER

Designed to meet the need for a simple, portable, direct reading, photo- electric luminance meter and general purpose photometer, the Hagner Uni- versal Photometer by Hagner Inter- national Ltd., 11 Goodge Street, Lon- don W1, is a precision instrument for the determination of luminance. It can also be used for the measurement of illumination, reflection factors, trans- mission factors, daylight factors, solid angles, exposure values and in the de- termination of glare indices.

Calibrated in the metric logarithmic scale, the meter is accurate within 10 per cent of absolute standard. It pro- vides direct viewing of luminance with- in angles subtending to either one or three degrees and has a range from 1 to 60,000 cd/sq. m.

The CdS cells used are fully colour corrected with a spectral response comparable with the human eye. An external cell, attached to the meter by a cable three metres long, is cosine

Hagner photometer

46

SPRAY PUMP

Developed by Nordson Corp., Jackson Street, Amherst, Ohio, USA, the Model 48 compact airless pump is capable of supplying coating material to two guns with .14 or 20 g.p.m. nozzles at system pressures up to 2,800 p.s.i. The unit has a maximum pumping

Nordson

Digitime digital clock

at the top to provide access to the glass-fibre fascia panel, which can be swung outwards on its own hinges at the left-hand side. A fluorescent tube in the base of the fascia illuminates the 9 in. high numerals, which are silk- screen printed on duralumin leaves.

The style of lettering and the colour combination of numbers and back- ground are optional, but the numbers illustrated are visible without distortion from practically any angle. The case may also be modified to suit individual requirements.

The manufacturer is interested in contacting overseas representatives.

VALVE

Protection against undue pressure rises in steam, oil, air and water systems can be provided by the Type 1516 flanged relief valve, introduced by Sir W.H. Bailey & Co., Ltd., Sharp capacity of .54 g.p.m. when operated Street, Walkden, Manchester, UK. This at 80 strokes per minute.

Model 48 spray pump

With a pumping ratio of 30:1, the pump will spray high viscosity mate- rials, for construction or maintenance painting.

The unit is available in wall-mounted models for circulating and non-circulat- ing systems, and in pail-mounted mo- dels for non-circulating systems.

CLOCK

A digital clock, in 12 and 24 hr. versions, for installation in or out of doors, has been developed by Digitime (International), 103, Davigdor Road, Hove, Sussex, UK. It is basically simple in operation, the drive coming from a synchronous electric motor via a cam- shaft to turn the pivoted leaves bearing the numbers.

The waterproof, corrosion-resistant steel case, which may be hammer finished in any of seven shades black, blue, two greys, bronze, copper and silver

measures 3 ft. 6 in. by 1 ft. 10 in. by 81⁄2 in. deep (106.7 by 55.9 by 21.6 cm.).

It incorporates a laminated safety- glass window, and the front is hinged

incorporates a totally-enclosed low- rate type of spring, which gives a maxi- mum lift with a minimum of pressure accumulation.

Available in six sizes, with inlet and outlet diameters of 2, 2, 3, 4, 5 and 6 in. (51, 64, 76, 102, 127 and 152 mm.), the Type

1516 has a cast- iron body and a bronze valve and seat. During nor- mal working con- ditions, the low-

rate spring pres- ses the valve firm- ly into its seat;

but any rise in- Valve section pressure above the set maximum forces the valve upwards, enabling the flow medium to discharge through the out- let port.

A range of standard springs can be fitted to the valve for pressures up to 150 p.s.i. (10.5 kg. per sq. cm.). Special springs are available for with- standing higher pressures up to 190 p.s.i. (13.4 kg. per sq. cm.) for steam systems not exceeding 430 deg. F.

Far East BUILDER, October 1968.