Report on the Trials of Implements at Bedford. 739 



diately they fall, thiis obviating the danger of fire. Xo kindling of wood is 

 required to get up steam ; but the rollers are first turned by hand to feed the 

 straw into the fire-box, and as soon as there is sufficient pressure of steam to 

 start the engine, the rollers are driven by a strap direct from the crank-shaft. 

 Only one man is required to feed the straw to the rollers.* 

 The dimensions of the engine were : — 



Diameter of cylinder . . . . 10 inches. 



Length of stroke 13 inches. 



Eevolutions per minute .. .. 140. 



Pressure of steam 80 lbs. per square inch. 



Area of grate 9*7 square feet. 



Total heating surface .. .. 266 square feet. 



Number of tubes 54. 



Outside diameter of ditto.. .. 2j inches. 



Fig. 49. — Plan of Messrs. Clayton and SJiuttleicorth's Governors for 

 Variable Expansion Gear, No. 5066. 



/-•Ian of3Isii-a.A 



PLAN 



," Coal or wood may be used as fuel, by altering the position of the bars and 

 substituting an ordinary fire-door for the mecbanical apparatus for feeding 

 the straw into the fire-box. 



* Further description and illustrations of these engines will be found in Prof. 

 "Wrightson's ' Report on the Agricultural Features of the Vienna Exhibition,' 

 pp. 72 and 73 of this volume of the ' Journal.' 



