Another Method of Renewing • Valve Seats.
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From time to time new methods have been evolved for the insertion of new valve -seatings into old cylinder blocks. One of the most interesting is that recently developed by the Andrews Crankshaft and Cylinder Co.„ Ltd., of Montague Street, Birmingham.
The problem which has to be solved is, of course, to key the new metal firmly to ' the old. In the latest Andrews system, the old seating is first bored out and the replacement ring is pressed into place, but near'the surface there is left a groove which may best be described as of "dovetail" section. This lies partly in the new ring and Partly in the block. Into this space is die-cast an aluminium ring, which acts . as an effective compression seal and, at the same time, prevents the slightest movement of the new ring.
Amongst the advantages claimed for this method of replacement are that the greater thermal expansion of aluminium, as compared with that of cast iron, produces a wedging action which forces the seating ring downwards on to its base. Furthermore, the gradual growth of aluminium, which is known to occur with successive beatings and coolings, helps to improve the joint with use. It will also be realized that, as the sealing ring is at the surface, it can easily be inspected and the groove in which it is placed does not coestitute a weakness at a critical point.
Anglo-Persian Oil Co.'s Trading.
In the year 1930 the _Anglo-Persian Oil Co., Ltd., made a profit of £4,648,579, as against 15,296,762 in
1929. After providing £487,217 for extra depreciation, a sum of £550,000 is to be added to several reserve funds and £500,000 to the taxation reserve. A final .dividend of 10 per cent. is to he paid on the ordinary shares, making. 15 per cent, for the year, as against 20 per cent. in 1929. The amount to be carried forward is £896,675, as against the carry forward of £687,064 in the preceding year.
Westinghouse Brakes for Buses.
The Westinghouse Brake and Saxby Signal Co., Ltd., has received an Order frpm the Associated Equipment Co., Ltd., for 58 vacuum-servo brake sets for installation in Regent buses which are being built for Birmingham Corporation. We learn that the Westinghouse brake is now standard on all powerbraked vehicles run by this authority.
The company has also received an order from Ransomes, Sims and Jefferie,s, Ltd., for 10 pressure brake sets for the trolley-blises which are being supplied to Nottingham .Corporation.
Representations to Traffic Chiefs.
Representations to the Traffic Cornmissiohers and r the Commissioner of Police are to be made by Barking Urban District Council, in connection with complaints that have been made following the prohibition of the halting of long-distance coaches passing through the district