Plain Cylindrical Boiler, with hemispherical ends, 23ft. long, and 5ft. diameter, 3/8 inch plates, 50 lbs. It was set so as to be fired under the bottom if required, but the grate was seldom used. The principal heat was supplied from a mill furnace, the neck of which was at the left hand of the back, and the flame was carried by a wheel flue round the front of the boiler to the stack on the right hand side of the back. The boiler was fitted with a 4-3/4-inch safety valve, and also a float, but it was suspected that the latter had broken from the rod. A horizontal seam about the middle of the left hand side had given way, and the upper portion of the 3rd and 4th rings of plates had spread out like a lid without being detached from the boiler. The front end became detached and was thrown some distance to the front. The cause of explosion was, that the left side of the boiler became overheated, and so much softened, that it first bulged outwards with the ordinary working pressure, and then rent open. The overheating was most likely the result of shortness of water, but it might possibly have been in consequence of the intense heat of a mill furnace impinging on a small area so near the water line, leading to such rapid ebullition as to prevent sufficient contact of the water to keep the plates cool. _No. 10. Dunse. February 14th. 1 injured._ Locomotive. It exploded while standing in a shed, but no particulars have been obtained. _No. 11. Middlesbro'. February 26th. 1 injured._ Marine, in a small tug boat, but no details have been obtained. _No. 12. Gainsbro' (Fig. 7) February 26th. 1 injured._ [Illustration: _Fig. 7._] One Tube Cornish, 21ft. long, 5ft. diameter, with one tube 2ft. 11in. diameter, plates 3/8 inch, 64 lbs. There were no strengthening rings on the tube. The boiler was second-hand, and had only worked a part of a day at its new position when it exploded. The tube collapsed from weakness without strengthening rings. _No. 13. Redruth. (Fig. 8.) March 3rd. 1 killed._ [Illustration: _Fig. 8._] One Tube Cornish, 31ft. 9in. long, and 5ft. 9in. diameter, tube 3ft. 8in. diameter, 3/8 inch plates, 40 lbs. The tube had been repaired with a bolted patch on the left side the day before the explosion, and it is presumed it was slightly out of the circular shape, as it collapsed sideways, the top being thrown up above its proper height. There was no evidence of shortness of water. The tube without strengthening rings was too weak to sustain the ordinary working pressure. _No. 14. London. March 5th. 7 injured._