[Fig. 3]. A Roman Chandelier. The gas enters through the inflexible hollow chain, a, into the central tube, b, from whence the burners are supplied by the lateral branches, c c.
[Fig. 4]. A Gothic Chandelier. The gas is transmitted to the burners through the rope, a, which includes a tube, and the communication with the burners is established through the lateral branches.
[Fig. 5]. A Pedestal Figure Lamp. The gas is here made to pass by means of a pipe through the body of the figure into the lattice-work plateau, constructed of hollow and perforated brass tubes.
[Fig. 6]. A Pedestal Vase Lamp. The gas-tube enters through one of the claw-feet of the altar-shaped pedestal, into the glass vase, a, at the bottom of which it joins the tubes communicating with the metallic corn-ears, b, at the upper extremities of which it forms jets de feu.
[Fig. 7]. A Girandole. The gas enters through the bracket, a, and is conveyed to the burners by the descending tubes, b b.
[Fig. 8]. A Candelabrum, having a central pipe, through which the gas is conducted to the burner at the top.
OTHER
PRODUCTS OBTAINABLE FROM COAL:
NAMELY,
COKE, TAR, ESSENTIAL OIL, &c.
Having thus far considered the nature of coal-gas as a substitute for the lights now in use, it will be necessary to attend more particularly to some other products which are obtained during the production of this species of light: namely, coke, tar, ammoniacal liquor, &c.
Coke.—The substance called coke, which constitutes the skeleton of the coal, or its carbonaceous base, is left behind in the retort, after all the evaporable products have been expelled from the coal by heat.—See [page 85].