. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Fig. 2. A Longitnilinal Section talten tliroiigh the centre of llie Engine. Fig. 3. Transverse Ssction takeo tlirougU tlie ceutro of the Ens; '^- ,!^»1 The letters of reference are the same in both sections. A—Is slialt in tlie centre of the engine, on which llie connecting arms supporting" tlie piston rod, and carrying a liead oi piu for tlie connecting rod to oscillate freely upon. B—Sleani chamber in which the piston C—Piston. D
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Fig. 2. A Longitnilinal Section talten tliroiigh the centre of llie Engine. Fig. 3. Transverse Ssction takeo tlirougU tlie ceutro of the Ens; '^- ,!^»1 The letters of reference are the same in both sections. A—Is slialt in tlie centre of the engine, on which llie connecting arms supporting" tlie piston rod, and carrying a liead oi piu for tlie connecting rod to oscillate freely upon. B—Sleani chamber in which the piston C—Piston. D—Circular piston rod, which is made of stquare steel, admitting of metallic packing to the stutling E—Blockings against which the outside covers of the cylinder are bolted, and also carrying the metallic .slutting boxes. FF—The slide valves shewn at one-third of the stroke. G—The Exhaust. HH—The pipes conveying the steam to the slide valves. II—The connecting arms oscillating on the fixed centre shaft, and carrying the weight of the piston, piston rod, Sec. KK—Are the steam ports. BUNNETT AND CORPE'S NEW PATENT CONCENTRIC STEAM-ENGINE. Messrs. Bunnett and Corpe, of Deptford, tlie patentees and inventors of the im[)roved iron sat'ety-slmtter, now In such liigli estimation and extensive use, have lately taken out letters patent for a concentric steam-engine, drawings of which we have given above. We shall tiist state the action of the engine, as we saw it at work in the paten- tees' manufactory, and then proceed to point out its advantages. It will be seen, tliat in appearance it is similar to a rotatory engine, but its- action is of a decidedly diH'eieiit character. The circular case, as shown in lignres I and 2, forms in the lower part the steam-chamber, in which is accurately (itted a sipiare piston, with Barton's patent metallic packing. Through the centre of the piston, and attached to it, is a concentric or ring-liUe piston-rod, which at a point
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