Photo-reproduced line drawings (3) Pitman's Pelton Wheel

[Photo-reproduced line drawings (3)] Pitman's Pelton Wheel / Percy Pitman. [ca.1915. : /1 Pitman's Improved 18" experimental Pelton water wheel for Technical Colleges (scale c.3":1'); /2 Pitman's Pelton Wheel & Direct-Coupled Dynamo; /3 Drawing No.501: Pelton Wheel (scale 1:4). Made by Percy Pitman, 'Manufacturer of Experimental Apparatus for Technical Laboratories', Victoria St, Westminster]