CATALOGUE OE THE BRITISH SeCTION.—ÄPPENDIX. 
35 
JOHN J. DERHAM, Engineer, 
Blackburn, Lancashire, England. 
Horizontal Engines may be seen working in tlie MacMnery Hall, 
British Section. 
STEAM ENGINES of all sizes and every description for driving Cotton, Jute, Flax, Woollen, 
Com, and other Mills ; Compound Beam and Horizontal Expansion Condensing and Non-condensmg 
Engines ; Vertical High-pressure Engines for working Mechamcs Shop, with double-acting 1 umps attache 
for fire extinguishing; Semi-portable Engines and Boilers, both horizontal and veitical , Pumping and 
Winding Engines for Mines, Water Works, Distilleries, &c.; Steam Donkey Pumps for feedmg Boilers, 
Steam Ind Hand-power Crab Winches, Cranes, and Hoistmg Machmery. Valves and Fittings of all 
clescriptions, all of the best construction, finish, and workmanship. 
GUT-OFF VALVES and Motion applied to Engines for maintaimng a uniform speed of Engine 
under the most extreme variations of load, dispensing with Throttle Valve, and ensunng the full Boiler 
Pressure of Steam on Piston at the beginning of each stroke. 
IMPROVED ELASTIC METALLIC PISTONS AND AIR-PUMP BUCKETS, 
Cylinders, Air Pumps, and Crank Eyes rebored in their places by practical and expenenced workmen. 
GEARING OF EVERY DESCRIPTION ; Mills completely geared up ; Wrought and Cast- 
Iron Beams, Pillars, Gutters, and Doors for Fire-proof Buildings, &c., &c., &c.^ 
ENGINES COMPOUNDED for economic and steady working, which principle may be advan- 
tageously applied to all existing single Cylinder Beam and Horizontal Engines. 
STEAM BOILERS ; Cornwall, Multitubular and Vertical, of best approved make and construction, 
Seamless Furnaces, and titted with Conical Water Tubes, &c. _ 
JOHN J. DERHAM begs to intimate that he has during the last fifteen years supplied Compound 
Steam Engines, Boilers, and Gearing to many of the large Cotton, Jute, Flax, and other Mills in Austria 
and other countries. Testimonials and References given upon application. 
Sole Manufacturer of SCHOLL’S Patent Atmospheric Power Hammer for Eastern Europe. 
Sole Agent for the sale of Agricultural Implement Machmery, as Manufactured by WILLIAM 
FOSTER & CO., Engineers, Lincoln, for Austria, Bavaria, and Saxony. 
Agent for GREEN’S Patent Fuel Economiser, for Austria and Poland. 
« No. 443, Group XIII.