D Uncertain causes 2 0 6 ------------ 2 0 6 ----------- 2 0 6 DOMESTIC BOILERS. A Weak shape 3 4 7 ------------ 3 4 7 B Corrosion 2 0 5 ------------ 2 0 5 C Undue Pressure from } freezing of Pipes } 9 7 9 ------------ 9 7 9 ----------- 14 11 21 BALLOON BOILERS. B External Corrosion 2 1 2 ------------ 2 1 2 C Undue Pressure 1 1 0 ------------ 1 1 0 ----------- 3 2 2 BOILERS OF UNCERTAIN DESCRIPTION. A Weak manhole 1 0 0 ------------ 1 0 0 {Steam entered through blow- } { off pipe from another boiler} 1 1 2 C { while cleaning } {Steam pipes broken 2 4 3 {Shortness of Water 1 1 4 ------------ 4 6 9 D Uncertain causes 2 0 3 ------------ 2 0 3 ----------- 7 6 12 ---------- _E_ _K_ _I_ TOTALS 219 315 450 TABLE IV. _Summary of causes of the Steam Boiler Explosions comprised in Table III._