Kingdom.] RAILAYAY AND MAKINE MECHANISM. 239

North Areas A. B. 10 to 34 ; C. D. E. 1 to 10, & 19 to 33 ; F. 1 to 32 ; G. H. 1 to 13, & 19 to 26.

manner, to the action of the fire in the furnace or fire-box,or to heat arising from it—that is to say, whether by meansof tubes running through the boiler and forming flues tothe heat from the fire, or by a casing about the fire in thefurnace—is the measure of the capability of the engine inrespect of both power and speed.

The diameter of the cylinder, the length of the stroke,and the diameter of the driving-wheel of a locomotive en-gine, act and react upon one another. Increase in the dia-meter of the cylinder increasing the area of the piston,and thereby its means of applying the power generated inthe boiler, is an advantage checked in a slight degree onlyby the consequent increase of the friction of the pistonin the cylinder:—increase in the diameter of the driving-wheel requires increased power to put and keep the wheelin motion, but it gives increased speed to the locomotiveas a body with the same speed of the piston in the cylin-der ;—but increase in the diameter of the driving-wheelrequires increased length in the cranks of its axle, andthereby greater length of stroke, whilst greater lengthof stroke increases the time of the stroke, and conse-

quently the time of a revolution of the driving-wheel._

W. H.]

514 Knox, G., Tottenhall, near Wolverhampton —Inventor.

Model of railway break carriage.

522 Fairbairn, W., Manchester —Manufacturer.Locomotive tank engine.

526 Wilson, E. B., & Co., Leeds; and 2 Poets’ Corner,Westminster —Manufacturers.

A locomotive double boiler tank engine and screw-moorings. The peculiar features of this engine are, itshaving two separate fire-boxes and boilers, so arrangedthat the stoking can be performed at alternate intervalsin each box. The class of engines is six-wheeled, havingfour wheels coupled by outside rods with inside cylindersand crank axle; the centre of gravity is low, and thegreater portion of the weight is carried by the coupledwheels securing a large amount of adhesion. The figurerepresents a side and half-end elevation of the engines.

LI

Scale ai Feet

Wilson & Co.’s Locomotive Tank Engine.

530 Williams, Charles Cave, Glasshouse Yard, GosaellStreet —Inventor and Manufacturer.

Railway carriage constructed entirely of East IndiaMoulmein teak, unpainted, the object being economy.As varnish only is used instead of paint, a carriage canbe repaired and got ready for work in a few days.

[East Indian teak is perhaps one of the most valuabletimbers for all purposes where lightness and strength arerequired. It is extremely durable, and resists to a con-siderable extent the invasions of fungi and insects. Itsnative habitat is the mountains of Malabar and otherdistricts, where it grows to an enormous size. Its botani-cal name is Tectona grandis. —R. E.]

532 Henson, Henry H., Pinner, near Watford —

, Inventor.

l atent improved covered waggon for the conveyance ofmerchandise^ by railway, constructed of wood and iron ona new principle. When closed, this vehicle is fireproofand waterproof, and any portion of the side or roof maybe e: ra- °P en . e d to load or unload. Fig. 1 shows an end,ana Fig. 2 a side, elevation of this waggon.

Fig. 1.

Henson’s Covered Waggon. End Elevation.