IX. MISCELLANEOUS. 461 



The frames, barrel of boiler, and fire-box casing, are of steel, and the axles 

 and many of the working parts are also of steel. 



2212J. Four Wheels coupled Passenger Engine, for 



heavy gradients. Size of cylinders, 17" X 24" stroke. Diameter 

 of coupled wheels, 5 ft. 6 in. Weight in working order, 

 31 tons, 8 cwt. F. W. Webb. 



The barrel of the boiler and fire-box casing are of steel, and the axles and 

 many of the working parts are also of steel. 



2212k. Fog Signal, universally used on railways. 



E. A. Cowper, Westminster. 



This fog signal consists of a small flat tin box, having a little gunpowder 

 inside, and some matches, which ignite on the box, being crushed by the 

 wheel of a passing train, so that a person on a railway can communicate with 

 the driver of a passing train even on the darkest night or during a dense fog. 



2213. Apparatus for showing the Motion of Fluids 

 through long Tubes. T. Hawksley. 



2214. Model of London and its Environs. Scale 12 

 inches to a mile. John Fowler, Westminster. 



Made for the purpose of showing before Committees of the Houses of 

 Parliament the railways existing or in course of construction during the year 

 1864 ; also the proposed system of the inner circle railway, comprising the 

 Metropolitan Railway, the Metropolitan and St. John's Wood Railway, and 

 the Metropolitan District Railway. 



2215. Improved Method of Reversing It oiling- Mills. 



Jeremiah Head, M. List. C.E. 



A separate piece is introduced between the clutch and each clutch wheel, 

 and connected with the latter only by elastic arms. The shock which ordi- 

 narily takes place when the clutch is thrown into gear is thus prevented. 



221 5a. Photograph of a Coal- testing Station. 



2215b. Description of experiments on Coal relating to steam 

 producing power ; determination of the proper breadth for the 

 spaces between the fire-bars, and treatment of the coal ; ashes ; 

 weight per hectolitre ; specific gravity and texture of the. coal. 



Berggeicerkschaftskasse Bochum (Bergrath Heintzmann). 



The coal experiment station is a central establishment for experiment on 

 Westphalian coal, designed for giving exact scientific instruction as to the 

 best uses of particular kinds of coal, and for ascertaining their comparative 

 practical values. 



2215c. Frisbie's Patent Feeder and Grate for feeding 

 fuel up from underneath the fire into all descriptions of furnaces, 

 fuel boxes, and fire grates, for saving fuel, securing an intense heat, 

 and consuming the gas and smoke. J. M. Holmes. 



This invention is designed for feeding fuel up from beneath the fire into 

 furnaces and fire grates. No fuel is thrown] upon the top of the fire, but into 



