Boxed set of 8 engine slide valve models, printed on card, designed by T and TG Jones, each 10.5x13cm, with box 12x18cm. With letter press instruction booklet 'Notes on slide valve models' [4th edition, John Heywood Ltd, Manchester 1905]. /2. Single Acting Piston Valve for Steam Hammer. /3. Meyers Variable Cut-off Valves. /4. Long D Slide Valve, Double Short D Valve /5. Short D Slide Valve (balanced). /6. Marine Engine Piston Valve. /7 Double Ported Slide Valve. /8. Simple Trick Valve.