182 Piercing of hot Iron by Sulphur. 
bouring pipes of two distinct manufactories in London, the 
one of coal gas, and the other of oil gas. 
_ Specific gravity, 
Coal gas, - - .4069 
Oil gas, - - - .9395 
When the flames were rendered equally luminous, the 
consumption, per hour, was, of 
Coal gas, ° - 4.85 cubic feet, 
Oil gas, - - - do. 
A gallon of clarified whale oil was found to produce 
more than 100 cubic feet of gas. ; 
Results, agreeing very nearly with the foregoing, were 
obtained by Phillips & Faraday. In two experiments wi 
gas taken from different establishments, they found the 
spec. grav. and illuminating power as follows. 
Coal gas. Oil gas, 
ist Spec. gravity, -4291 -9637 
Z Illuminating power, = 1. 3.567 
Coal gas. Oil a4 
Spec. grav. -4069 93 
4 ig i lilum. power, 1. 3.541 
tie, 
3. Piercing of hot Iron by Sulphur —Colonel Evasin, 
director of the Arsenal of Metz, in a letter to Gay Lussac, 
states the following experiments. : 
| placed a bar of wrought iron, about 16 millimetres 1D 
thickness, (,%; inch) into a common forge, fed by {oss! 
coal, and when it was welding hot | drew it out, and ap- 
plied to the surface a stick of sulphur 6, of an inch in di- 
ameter. In 14 seconds the sulphur had pierced a hole 
through the iron, perfectly circular. Another bar of iron 
2 inches thick was pierced in 15 seconds. The holes had 
the exact form of the sticks of sulphur employed, whether 
cylindrical or prismatic. They were, however, more reg 
ular on the side at which the sulphur came out, than of 
that to which it was applied. 
