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Gaston et Henri Venot Lathe

If this lathe really is by a manufacturer called Gaston et Henri Venot must be uncertain. The lathe carries a riveted-on badge proclaiming Gaston et Henri Venot 153, Rue du Temple, Paris - but that is, I'm afraid to say, more likely to be just the selling dealer.
With a centre height of 105 mm and  accepting 500 mm between centres, the lathe is of conventional design and, judging by things such as the large micrometer dials on the cross and top-side screws and its drive system, would have been manufactured between 1930 and 1950. The slow-speed backgear is carried on an eccentric shaft and screwcutting, by changewheels, passes through a tumble-reverse mechanism with a spring-loaded selector handle.
Of typically "English" small-lathe design, the bed has flat-topped ways and narrow vertical guides while the saddle, with its equally-sized arms at each side of the cross-slide, can travel for a short distance past the front and back faces of the headstock to bring the cutting tool right up the spindle nose.
Drive to the headstock spindle - all by flat belts - is transmitted from a motor low down on the back of the headstock-end plinth, to a neat, integral countershaft bolted to the back of the bed. A rather pleasing feature is the method of setting the tension of the spindle's drive belt - a handwheel on the front face of the bed immediately below the headstock turning either a screw, to move the countershaft to and fro - or operating a lever system to achieve the same effect - the latter system being used on some versions of the Myford "4-inch Precision" details of which mechanism can be seen on this page.