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SERVISAIR, the international aviation ground handling specialists, has simplified its complex cleaning tasks and cut costs by employing two high performance cleaning products from Ambersil Ltd., of Basingstoke, Hants.

Brief Particulars of Recently Introduced Materials likely to have Aircraft, Missile or Space Vehicle Applications. A new aerosol spray that is convenient to use and time‐saving is now available to the engineering and allied trades for freeze‐fitting metal parts and other uses requiring a very low temperature.

Brief Particulars of Recently Introduced Materials likely to have Aircraft, Missile or Space Vehicle Applications. A versatile, easily‐applied maintenance product with a host of industrial applications — this is Ambersil 40+, the new complete maintenance treatment from Ambersil Ltd., James Estate, Western Road, Mitcham, Surrey.

Long life on the Dead Sea. The Dead Sea Scrolls Expedition faced severe corrosion hazards in addition to their literary‐archaeological problems when the metal surfaces and electrical circuits of their outboard motors were exposed to local conditions of extreme salinity and heavy condensation. The solution (to corrosion) was found in a silicone grease material Ambersil MS4, which was applied by aerosol to the metal surfaces and electrical circuits and succeeded in preserving these for the duration of the expedition.

Rust‐preventing Composition. A rust‐preventing composition, Anodite, is stated to be non‐poisonous and ready for use. Its action can be explained in terms of the electrochemical theory of corrosion. The unusual pigment employed reacts with a specially designed vehicle, both in the package and in the dry form after application, to form compounds capable of stifling the formation of rust. These compounds react with the products formed by the attack of corrosive agents as anodes in the ferrous surface and form protective layers, retarding or stifling continued attack. This result is claimed to be achieved without resource to pigments sensitive to moisture or unsuitable for prolonged atmospheric exposure.

The Standard Pressed Steel Co., of Jenkintown, Pennsylvania, have introduced a range of aircraft bolts made from a 5 per cent chromium hot worked die steel called Vascojet 1000, produced by Vanadium‐Alloys Steel Co., Latrobe, Pa. The fastenings are given the name Hi Tm 9 fasteners, and have a minimum U.T.S. at 900 deg. F. of 170,000 lb./sq. in.

OF the two types of thrust bearing employing, respectively, slot and orifice feed, investigations at the City University have shown that if steam is admitted as a lubricant, the slot configuration does not suffer from excited vibration in the form of pneumatic or steam hammer. Typical orifice‐fed and slot‐fed air type bearings are shown in Figs. 1 and 2 respectively.