The cause of the explosion was supposed to be over-pressure during a temporary stoppage of the engine.
No.32. Barnard Castle. ([Fig. 18.])
June 11th.
2 injured.
Fig. 18.
Agricultural, of about 7 horse power. The barrel of the boiler was 6ft. 1in. long, 2ft. 5in. diameter; the fire-box end was 3ft. wide, and 2ft. 4in. deep; the fire-box was 2ft. 5½in. wide, and 2ft. 7in. high, and 1ft. 9½in. deep, with 23 tubes passing from it through the barrel to the smoke box and chimney. The boiler was fitted with a 2in. safety valve, which was intended to blow at 45 lbs., but as there was no ferrule, it is supposed to have been screwed down to a much greater pressure.
The upper portion of the shell over the fire-box rent through the manhole, and allowed the shell to open out and fall on each side. A large portion of the front plate was also torn off.
The cause of the explosion was the weakness of the manhole, which was not strengthened by any ring, and also excessive pressure from want of proper safety valve.
No.33. Breage.