Note 53 — PART XV.
Reading edition
Vegetable tar, also affords carburetted hydrogen gas in abundance, and this no doubt might be employed to great advantage for the production of artificial light in places where it is cheap. 212 pounds of the most viscid Swedish tar, produce 1484 cubic feet of carburetted hydrogen, (or seven cubic feet to one pound of tar,) the illuminating power of this gas is equal to the gas obtained from pit coal.