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Aviation History
1948
1948 - 0762.PDF
are produced mostly small aircraft C A A D T f\ h AVcomponents. Machine tools of the JAAD lU'UAT . . . type to be found in most aircraft fac- " tones are in position, and many com- ponents are produced on routing machines and on the rubber press. Other departments in which there is space for immediate expansion in emergency are stores, inspection, raw material reception and heat treatment. Welfare and psychological considerations have received careful attention, as would be expected in a country with the high standard of. living enjoyed in '"""Sweden. Careful observation of employees who have been working below ground for some months, examination of accident and sickness statistics, and a comparison of their health with those of the same age and sex doing similar jobs in the factory above ground, have failed to bring to light any adverse condition underground. In fact, from the points of view of temperature, humidity, lighting and absence of draughts, working conditions below ground are much better than in the average building. The most marked difference, strangely enough, is that the percentage of employees giving notice for one reason or another, is 4 per cent lower in the underground factory. Workshops, canteens and changing rooms underground are all fine, large, concrete halls with gently arched roofs. They are well lighted, using both mercury vapour and filament lamps, and, of course, air conditioned. The air- conditioning system is divided into a number of sections in order to cope with the widely varying conditions of heat and atmosphere contamination in the various parts of -the factory. The bulk of the air for the system is re-circulated after conditioning, but sufficient air up to 120 cubic metres per hour per person can be drawn from outside. In the event of a gas attack, work continues, and only sufficient external air is added to compensate for the oxygen deficiency, and this is purified in gas filters at the point of admission. Air temperature in the underground workshop varies by only 1 deg. C, and the relative humidity is 30 to 60 per cent. Water for the cooling plant is drawn from two wells bored beneath the factory to a depth of about 300ft. The wat€jj^ is pumped to a reservoir and after being drawn through the cooling plant is returned to another intermediate reservoir before being finally pumped into the factory water mains and from there to the town drainage system. From the accompanying illustrations it will be seen that the various depart ments in the underground factory give a cool and spacious impression, while the main escalator closely resembles the modem style adopted for the London underground railways. The main entrance hall has been made attractive by causing water from the cooling system to flow from a cavity in the rock as if it were a natural underground stream, and illuminating it with coloured lights. Such pleasing effects with the addition of tanks of fish and bright lighting, prevent any feeling of oppressiveness assailing those descending into the factory It was found that employees working below ground frequently wondered what the weather was like outside. The management, therefore, installed a number of large clocks which not only gave the time but the weather, tempera- ture and wind strength. The ground-level factories at Linkoping and Trollhattan are large well- equipped plants with fine modem office blocks. They are both going through a change-over period due to completion of contracts and commencement of new productions, principally of the Scandia at Linkoping, and the 21R and SAAB car at Trollhattan, where the newiy installed machine tools are of particular interest.
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