of driving the machine tools from the lorry engine is by means of a triple set of whittle belts to the dynamo, and thence the power is transmitted to the machines. The speed of the engine is maintained constant by a specially designed centrifugal governor. Imitation being the sincerest form of flattery, this system of drive in one form or another has since been copied in many workshops of the mechanical transport units in France. In addition to the workshop lorries, O.C. Workshops has a two-wheeled "trailer" of his own design and construction, which when the column is on the move is coupled up to one of the workshop lorries and towed by the latter. It is designed to carry two spare engines complete. When stationary, it acts as a fitting, erecting, and engine-testing bench, and on it all lorry engines are overhauled and refitted as occasion requires. On the trailer is fixed a crane, which enables the engine that is to be overhauled to be lifted direct from its lorry chassis and placed on the trailer. Conversely, the crane replaces the reconstructed engine into its chassis, time and labour occupied by the operation being considerably reduced by the use of this device as compared with manual labour and pulley blocks. The time during which the lorry is out of action is appreciably reduced; it becomes a matter of hours instead of days, for the engine that is removed from the chassis for overhauling purposes is replaced for the time being by one of the engines which is in running order carried on the trailer. Moreover, without the mechanical advantage gained by the use of the trailer and crane, the operation would naturally take very considerably longer and the lorry be out of action for a proportionately longer period. The O.C. Workshops has also designed and constructed numerous other time- and labour-saving appliances; for example, he has made extensions to lathes, enabling almost any part of a lorry to be machined in them when required. To enable the blacksmiths to tackle any job that might be required, he has made and fitted up an electrically driven "Roots" blower. Thus it is only necessary to build up a hearth of bricks and mud, set up the blower, switch on the electric current, and a roaring welding fire within a few minutes is the result. Although these workshops are designated "mobile," and only intended for the carrying out of simple and "running" repairs, the blacksmiths have literally forged axles by the roadsides. Amongst other appliances must be mentioned the brass furnace, in which is melted up all old scrap, such as used up phosphor or bronze bearings, etc., and from such metal, when poured, castings are made of every conceivable brass part of a car or lorry that could be required. It is not uncommon for 2 cwt. of metal to be "run" in a day from this furnace and cast into moulds, the necessary "patterns" from which the castings are moulded being also made by artificers of the workshops.