No_6_1956 — Page 78

tube is therefore Alkathene" compound it can be bent hot or cold. With the controlled length of time (normally about B2 9902. This is based on a tough latter some clamping is necessary but with 15-30 secs.) locally heats both fitting and "Alkathene" grade to which 2-3% carbon the former permanent bends can be made tube around the heating element and black is added to prevent degradation of by heating the tube (by blow lamp or by welds tube and fitting securely into place. the tube when it is in service (for example immersing in hot water) and allowing it The in the tropics. Anti-oxidants are

to cool while it is held in the bent state. also incorporated as а further safeguard to prevent oxidation during manufacture and

service.

con-

connecting wires are then trimmed back SO that a neat, unobtrusive but Tubes made from "Alkathene" can be robust water tight joint has been made. joined with conventional metal fittings

Complicated plumbing is therefore a but recent developments have made pos-

made from sible for the first time without any special thing of the past if tube

"Alkathene" is used, It can be laid with tube manipulation an ali polythene plum-

This is bing system.

done by using a minimum of joints and fittings and no For a tempor- "Alkalite" fittings. They are made from maintenance is required. at

it is unrolled "Alkathene" and during manufacture two ary line in rugged areas, metallic rings forming an electric heating from the coil, laid around obstacles and

water supply. element are moulded into each socket of fixed to a

A permanent the fitting. Two leads from the element line is set up simply and cheaply by lay- a shallow trench. Its life is project from the end of the fitting to form ing in electrical connectors. Current supplied endless since it does not rust, corrode, through the connectors from a suitable scale or block and any soil movement Polythene tube is readily installed since well charged heavy duty battery for a leaves the tube unharmed.

The "Alkathene" is processed on ventional extrusion machines at very high

2" outputs e.g.

diameter tube can be produced to very close dimensions about 100 ft. per minute, and thus with its economic rate of output, its light weight and its many technical advantages, tube made from "Alkathene" is a product of very great potentiality as experience in

Great Britain has shown.

I

- CORONET COURT -

JAIL

LI THE HIL

ELELE

184

A large apartment project in North Point which will be fully described in our next issue.

76