Small internally fired Boiler, 5ft. high, 2ft. 4in. diameter, and was intended to work at 70 lbs. The fittings were defective, the spiral spring of the safety valve being most easily altered, so as to cause over pressure. The manhole was not strengthened by any ring, and the first rents commenced at that point. The cause of the explosion was over pressure and defective construction. The sketch at No. 57 explosion in this year, is of a similar boiler which exploded from nearly similar causes. _No. 24. Bilston. (Fig. 14.) May 13th. none injured._ Balloon or Haystack Boiler, about 16ft. diameter, 5/16 inch plates, and worked at very little above atmospheric pressure. The boiler was chiefly used to store water during the time another boiler by the side of it was emptied. When the water was required to refill the other boiler, a fire was lighted under the balloon, and sufficient steam generated to drive the water from it into the other boiler. The safety valve never being used, it had become fast, and as a little more steam than usual had accumulated, the bottom gave way, and the reaction of the issuing contents made the boiler rise from its seat, and it fell on its side at some distance away flattened by the fall. [Illustration: _Fig. 14._] _No. 25. Westbromwich. (Fig. 15.) May 25th. none injured._ [Illustration: _Fig. 15._] One Tube Cornish Boiler, 15ft. long, and 4ft. 6in. diameter, taper tube, 2ft. 9in. diameter in front, and 2ft. diameter at back, 3/8 inch plates, 40 lbs. The boiler rested on two walls forming the bottom flue. There was a safety valve, a glass water gauge, a pressure gauge, and two fusible plugs upon the tube. Two longitudinal rents took place on the under side of the shell, allowing two strips, forming the central part, to open out by the continuation of the fracture, until they were blown to a considerable distance. The tube with the front end, and one ring of the shell were thrown to the front, while the back end was thrown to the rear, the smallest end of the tube having torn away from the back. The shell was deeply corroded where it rested on the side walls of the bottom flue, and the strength of the boiler was thereby so much reduced, that it was unable to bear the ordinary working pressure. _No. 26. Halifax. (Fig. 16.)_ _May 26th. 1 killed._ [Illustration: _Fig. 16._] One Tube Cornish, 24ft. 6in. long, and 5ft. diameter, taper tube, slightly oval in the front, 2ft. 8in. diameter, and 2ft. diameter at the back, 3/8 inch plates. The boiler was fitted with glass water gauge, float, self-acting feed apparatus, and safety valve loaded to 52 lbs., and also a mercury gauge. The tube collapsed over the fire, a rent taking place in the second ring of plates. The issuing steam and water caused the death of a man in front, but the shell of the boiler was not injured or moved.