chains, rolling pieces between engine and tender, intermediate buffers and ball-joint connection to be fixed as per drawings. Drawhook to be provided with a screw-shackle the same as for the engine, and to be mounted with a Timmis's spring.

Buffer-beams. To be of wrought-iron, frame-plate quality, as per

drawing.

Buffers. To be Turton's patent wrought iron buffer, B 3 pattern, manufactured by Messrs. Ibbotson Brothers and Co., as per drawing.

Springs. Of the best Swedish spring steel, and to be manufactured by Messrs. John Spencer and Sons, of Newcastle-upon-Tyne. Each spring to be tested in the same manner as described for the engine springs.

Brake. Tender to be fitted with a vacuum brake, consisting of two 15-inch Hardy sacks, which, together with wrought iron piping, elbows, and couplings, and flexible hose-pipe connection between engine and tender, are to be obtained by the contractor from the Vacuum Brake Company. A solid angle iron ring for carrying the sacks to be fixed to under side of tender at front end between longitudinal stretchers, as shown on drawings. Sacks to be connected by links to the levers of brake shaft, which is to be also provided with a lever for hand brake. The entire brake arrangement and details, such as handle, brake, screw, brake shaft, hangers,

blocks, carriers, rods, and cross-bars to be made in accordance with drawings supplied.

Handrail. Handrail of iron piping 14 inch diameter outside, polished and fastened by two brackets to end of tank. Two handrail pillars to be placed on each side of foot-plate and fixed to tank, as shown on drawings.

Lamp-holders.-Two to be fixed on back of tender, as shown on

drawings.

Bolts, Nuts, and Threads.-To be of Whitworth standard.

Painting. The inside of the tender tank to have two coats of good thick red lead; the outside of the tank, cab, and tool-box to be prepared and finished in the same manner as the engine boiler covering. The inside of the cab to be treated exactly the same as the inside of the engine cab. Inside of frames to have two coats of lead colour. Outside of frames and wheels to be prepared and finished identically the same as those of the engine. Hind buffer beams and buffers to be finished vermilion and varnished. Coke space, foot-plate, bottom of tank, and brake-work under tender to have two coats of black.

SPECIFICATION FOR FOUR-COUPLED EXPRESS LOCOMOTIVE, GREAT EASTERN RAILWAY.

Express Locomotive Engine, designed by MR. T. W. WORSDEll, Locomotive Superintendent, Great Eastern Railway Works, Stratford.

The tender holds 5 tons of coal and 3200 gallons of water.

SPECIFICATION FOR EXPRESS ENGINES, LONDON,
CHATHAM, AND DOVER RAILWAY.

These engines were designed by MR. W. KIRTLEY, Locomotive Superintendent of the line, for working heavy trains at express speed for Continental traffic.

The engines described in the following specification are known as class M. The following are their leading dimensions:-Diameter of cylinders, 17 inches; stroke of cylinders, 26 inches; diameter of bogie wheels, 3 feet 6 inches; diameter of coupled wheels, 6 feet 6 inches; total wheel base of engine, 21 feet of inch; total wheel base of tender, 12 feet; heating surface of tubes, 962 square feet; fire-box, 107 square feet; total heating surface, 1069 square feet; grate surface, 163 square feet; capacity of tank, 2550 gallons.

Quality of Materials.-Where "brass" is specified it must be good tough metal. Gun-metal must be composed of five parts of copper to one part of tin. White metal.—This must be composed of-Tin, sixteen parts; antimony, two parts; copper, one part and a-half. Other materials to be obtained of the manufacture to be hereinafter specified, unless the consent of the company's locomotive superintendent in writing be first obtained to an alteration.

Boiler.-Barrel, dome, fire-box casing, and smoke-box tube plate, and all angle irons, rivets, and stays to be made of Lowmoor, Bowling, Taylor's, or Cooper's (best Yorkshire) iron. Barrel to be made in three plates as