In fig. 48 we give an elevation of an oscillating engine by Evans exhibited in the Crystal Palace; and in fig. 49 another example also exhibited in the same place; it is of very elegant design, in the Gothic style, and is manufactured by Pope and Sons of Greenwich.

In fig. 50 we give two views of a modification of the oscillating engine,

introduced by Mr. Joyce of Greenwich, and termed the "pendulous engine." The principle introduced by Woolfe is carried out in this form of engine; the cylinders are bedded side by side, and inverted; and suspended between the framing, the trunnion-pipes or steam-ways being placed at the ends, or what in the ordinary engine would be termed the bottoms of the cylinders. By this arrangement, a direct motion is given to the crank, without the introduction of the usual assemblage of appliances on the beam-engine. The cylinders vibrate from side to side, the movement of the cylinders working the slides by means of a bar; in the cuts, fig. 50, a front and side elevation is given.

Portable steam-engines are now much used for a variety of purposes, and in agricultural operations. In fig. 51 we give a view of Clayton and Shuttleworth's agricultural portable engine; and in fig. 52 Messrs. Barrett and Exhall's engine for the same purposes. In fig. 54 we give an elevation of Gough's portable engine, for pumping water from quarries and

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excavations: and in fig. 53 another adaptation for drawing up earth from railway cuttings, &c. &c.

In fig. 157, p. 81, Mechanics and Mechanism, we give the side elevation

of a steam-pumping engine, applicable as a portable steam-engine for agricultural purposes by disconnecting the pump; we now give the front elevation, in fig. 55; a cylinder; b crank axle and horizontal slide; d the plunger; ef air-vessels; g inlet; h outlet.

In fig. 56 we give an illustration of the steam-engine for working a fan

for withdrawing air from mines; and in fig. 57, Usher's steam-plough. In p. 113, fig. 206, Mechanics and Mechanism, we give an elevation of Nasmyth's steam-hammer.

In another chapter we propose to describe the rotatory engine, and

other varieties, as the disc-engine, the arrangements of which present peculiarities different from those which we have already described. In the mean time we hasten to describe the various details of the cylinder engines.