Interesting Features in
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Scamrnells for Overseas TAnglo-Persian Oil Co., Ltd., was one of the pioneer users of Scammell vehicles, and some early machines bought by the companyare still in service in Persia. The concern has recently bought two special articu lated eight-wheelers having a useful load capacity of about 13 tons. The vehicles have special all-metal flatplatform bodies and are to be employed in the oilfields, chiefly for con: veying drilling plant and stores.
Scammell Lorries, Ltd., is also supplying two large-capacity petrol tank wagons to the same company. These are being constructed on the well-known Scammell patent frameless principle and will each have a capacity of 4,009 gallons. The Anglo-Persian Oil Co., Ltd., has recently erected a new refinery at Kermanshah, and these new -tankers will be used for the distribution of petroleum spirit to Teheran and other centres in Persia. Distribution will be effected over a radius up to 500 miles, the routes being over sonic of the hilliest country in Persia, with altitudes ranging from 4,000 ft. to 10,000 ft. above sea level. A sleeping bunk is being provided in the cab of each of these vehicles.
A representative of this paper recently inspected one of the 13-tonners, which has since been delivered. These vehicles incorporate many interesting features. One of them is the wide employment of welding in the construction of the trailing units.
Each main girder is constructed of two side plates and a base plate set to form, in section, a fiat-bottomed V. the sides being lightened by the formation of a series of holes with turned edges to prevent buckling. They are braced transversely at intervals and carry bracket-pieces on their outsides. With the platform and side girders the whole of this bodywork is welded up.
The bogie cross-member is of box section, also welded, whilst the carrier front end is reinforced by steel buttresses to withstand forward thrust imposed by the load.
Two spare wheels are carried—one en the forward side of the front of the trailing unit, the other suspended by screw-and-nut-operated cable amidships. The tyre equipment is Dunlop 13.5-in. by 20-in, pneumatics, and the unit weighs 4 tons 10 cwt. •
• Scammell petrol engines comprise the power units for these two vehicles. Special precautions have been taken in connection with cooling and air filtration. The radiator is of the wire-gilled Still-tube type. The filter is a huge apparatus designed and built in the Scammell works at Watford.
Air enters at the top and is drawn straight down by a central tube terminating in, a cone with an annular orifice. The base contains oil on which the air impinges, depositing its heavier sand and dust content.
Thence it is drawn through a large pellet-type filter—a product of The Visco Engineering Co., Stafford Road, Croydon—on its way to the carburetter. The Visco element consists of a thick layer of small metal hollow-cylindrical pieces :accommodated between coarse-mesh wire gauzes. The whole filter base is detachable, so that renewal of the oil and cleaning of the element is an easy matter.
Finally, the inclusion of Gross airsprings, made by J. MacDonald and Co. (Pneumatic Tool's), Ltd., Pollokshaws, Glasgow, is ¬eworthy feature.
The tractive unit weighs 4 tons, so that the complete vehicle scales 8 tons 10 cwt.