have openings at each end for inserting and removing the valves, and are closed by singleplate covers of cast-iron, well ribbed, finished on outside with faced flanges 34 inches wide and 134 inches thick.

The inboard covers contain the valve-stem stuffing-boxes; the outboard serves as the valvestem guide. The packing spaces are fitted with metallic packing. The covers are secured in place by 1-inch bolts, spaced 6 inches apart, and with finished wrought-iron nuts. Suitable bosses are cast on the upper surface of steamchests, directly over each steam-port, for the attachment of oil-cups.

Valve Liners.-The valve liners are made of cast-iron of the toughest quality, combined with a suitable degree of hardness. They are % inch thick, accurately bored and turned; then forced into seats after the ports were cut out 31⁄2 inches for H. P. and M. P., and 35% inches for L. P. The bridges in ports are 1 inches wide. Main Steam Piston-Valves.-The piston-valve is made of composition, inch thick in the body of the valve.

Each end of all valves is made steam-tight by two packing-rings of composition, 5% inch square in cross section, cut obliquely, and held in place by a composition follower and wroughtiron bolts. The distance-pieces for separating the packing-rings at each end of the valves are made of composition.

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Main Valve-Stems. - The valve-stems made of steel, 23% inches diameter where they pass through the valves, and 31⁄2 inches diameter in the stuffing-boxes.

Throttle-Valves.-The main steam-throttle for each high-pressure cylinder consists of a discvalve 15%1⁄2 inches diameter of opening, opening with the pressure in the steam-pipe, and is operated by suitable gear with hand-lever adjacent to hand-lever of steam reversing-gear.

Valve-Gear.-The valve-gear is of the radial type. The cut-offs of all cylinders are capable of being adjusted independently of each other.

The distribution of steam in backward gear is such as to permit the engines to be reversed quickly and to run astern at full power.

The eccentrics are made of cast-iron. Each eccentric is made in two parts, securely fastened together by two mild-steel bolts. They are truly bored to fit the shaft and properly secured to the same. They are truly turned to a suitable eccentricity, and recessed at the sides to fit the flanges of the eccentric-straps.

Each eccentric-strap is in two parts, of cast steel, with white-metal linings. The two parts are firmly fastened together by two mild-steel bolts with lock nuts. The two parts of the strap are separated by suitable brass chippingpieces. A prolongation of one part of each eccentric-strap forms the eccentric-lever.

Each eccentric-lever has two mild-steel pins, one with a hardened steel thimble securely fastened.

One of these pins engages with the radius-link and the other with the valve-connecting-rod.

The movement of each valve is regulated by a reversing-arm and a radius-link.

Each reversing-arm is carried in bearings rising from the top of the corresponding crankshaft bearing, with its main centre line parallel to the axis of the crank-shaft, and in the same vertical plane. The reversing-arm with its journals is of cast-steel. A forged steel pin is secured in the free end of the arm to engage with the radius-link. Each radius-link engages at one end with this pin and at the other with the lower pin on the eccentric-lever.

Each valve-connecting-rod engages at one end with the corresponding pin in the eccentriclever and at the other end with a pin in an arm on the valve-motion rock-shaft.

The valve-motion rock-shafts are carried in bearings bolted to the cylinder casings, and have arms set at suitable inclinations to each other by which the motion is transmitted to the valvestems by links.

The radius-links, valve-connecting-rods and valve-links are forged of mild steel, finished all

over.

All joint-pins are of steel.

All working bearings are of phosphor-bronze or other composition.

The reversing-arm bearings are cast on the main pillow-blocks. The valve-motion rockshafts and arms and reversing-arms are of caststeel.

The radius-links are capable of adjustment so as to preserve a constant distance between centers when taking up lost motion.

Fixed trammels are furnished, suitably protected from injury, for setting the radius-link centers to their proper distances.

The valve-stems are marked and furnished with fixed trammels for setting the valves without removing the valve-chest bonnets.

A spare set of bearings is furnished for all adjustible joints.

All parts of the valve-gear are suitably marked for convenience of putting together properly when overhauling.

Reversing-gear.-Each engine has a steam reversing-gear with the cylinder placed vertically. Each main engine has one hand-reversing lever, which is conveniently placed to be worked from the working-platform. The reversinglever sectors have adjustable stops to prevent the hand-levers being thrown beyond the full-ahead and astern positions.

The reversing engines exhaust into the respective condensers.

Steam Governor.-There is an efficient governor of an approved type, with all necessary connections fitting to the reversing lever of each engine, so as to control the admission of steam. to each cylinder for preventing racing in rough weather.

Cylinder Relief Valves.-There is an automatic relief valve of 3 inches diameter, located at each end of each cylinder; these valves are guided by loosely fitting wings. They are kept on their seats by the pressure of steam in their respective receivers and by a light spiral spring.

Cylinder Drain Valves.-There is fitted to each end of each cylinder, a drain valve of approved design, with 1-inch opening. These valves are made of composition and are flanged and bolted to bosses on cylinder casings. They are arranged to work by hand-levers at working platform if found necessary.

Pistons. The pistons are made of steel, the thickness of metal 234 inches at center and 11⁄2 inches at periphery; that around the eyes of the piston-rods is 234 inches. Each piston has one cast iron wearing-shoe upon which it rests. These shoes are so fitted that they can be adjusted to take the wear. The packing-rings are 34 inch thick, 5% inch wide, and are adjusted by steel springs of proper tension.

Piston-Rods.-The piston-rods are of steel, finished 71⁄2 inches diameter, fitted and secured