XI. MISCELLANEOUS. 549 



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

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



Berggewerkschaftskasse 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 

 a charger which rocks forward to the front of the furnace under the grate 

 bars. By turning a crank geared to a central shaft the charger is carried back 

 under a central opening in the grate, when a piston rises in the charger and 

 pushes the fuel up underneath the burning mass above. When the piston 

 rises level with the top surface of the charger, it is retained in place by a 

 catch until a reverse motion of the crank brings the charger again to the 

 front, when the catch releases the piston and the charger is again ready for 

 filling, the previous charge of fuel being sustained by a movable apron. The 

 grate is constructed to revolve, so that any melted coal or slag can be brought 

 to the door and removed quickly. 



By this method of firing the ignition of the fresh coal is downwards, and 

 all the volatilised coal, combustible gas, and carbonaceous matter pass from 

 below through the live coals above, and break at once into flame, securing 

 the greatest intensity of heat, and consuming the gas and smoke, thus effect- 

 ing a great saving of fuel. 



2216. Model of a Blast Furnace Boiler, upon elastic 

 supports. Jeremiah Head, M.Inst.C.E. 



Long plain cylinder boilers, when hung as ordinarily upon rigid supports, 

 are found to rise clear of the latter at their ends when in use, and in the 

 middle when out of use. This leads to seam rips, and frequently explosion. 

 By turning the small hand wheel right or left, it will be seen that, by the 

 method exhibited, the boiler is able to modify its form without straining, and 

 consequently without danger. 



2216b. Model of an Apparatus for Exchanging De- 

 spatches on Railways, without Stoppage of the Trains. 



M. Cacheleux, Paris. 



Delineation of the original Steam Omnibus used for 

 a short period on the city and other roads for passenger traffic. 



Gardner Collection. 



2216c. Model of the late John Grantham's Patent Steam 

 Tramway Car. 



Also a detailed drawing of the above. 



Mrs. John Grant-ham* Croydon. 



