Fig. 3. _A Bracket Lamp._ _a_, the tube which conveys the gas to the burner; _b_, the stop-cock of the tube.
Fig. 4. _A Pendent Rod Lamp_; in which the gas is supposed to come from a pipe above, through the ceiling, into the pipe, _a_, to supply the burners. The tulip-shaped chimney, _b_, of this lamp, is likewise ill adapted for gas-light burners.
Fig. 5. _A pendent double-bracket Lamp._ The gas passing through the perpendicular tube, _a_, into the brackets, _b_ _b_; _c_ shows the Argand burner.
Fig. 6. _A swing Bracket Lamp._ _a_, the gas-pipe with its stop-cock; _b_, a brass ball, communicating with the pipe, _a_; _c_, the conducting tube, ground air-tight into the ball, _b_, and communicating with the burner of the lamp, so as to allow it to have an horizontal motion.
Fig. 7. Shews the construction of the ball _b_, and pipe, _c_, of the lamp, fig. 6.
Fig. 8. _A Swing Cockspur Lamp_, constructed upon the same plan as fig. 6. These two lamps are very convenient for desks in counting-houses, &c.
Fig. 9. A stop-cock with ball and socket, which, when adapted to a gas-light pipe, allows it to have an universal motion, so that the light may be turned in any direction.
Fig. 10. Section of the stop-cock, with ball and socket.
Fig. 11. Shows the ball and socket, fig. 9, in perspective.
PLATE IV,[26] fig. 1. _A Candelabrum_; the gas pipe ascending from the floor of the apartment, through the column _a_, and terminating in the burner of the lamp.
[26] The gas-lamps exhibited in this plate, are employed in the library, counting-house, warehouse, and offices of Mr. ACKERMAN, and, by whose permission, they are copied on this occasion.
Fig. 2. _A fancy pendent Cockspur Lamp._ The gas being transmitted to the burners, _c_ _c_, by means of the pipe, _a_.
Fig. 3. _A Pedestal Argand Lamp._ _a_, the pipe and stop-cock, which transmits to, and shuts off the gas from the burner of the lamp.
Fig. 4. _A Pedestal Cockspur Lamp._ _a_, the stop-cock and gas-pipe.
Fig. 5. _A fancy bracket Cockspur Lamp_, intended merely to show that the coal-gas, as it passes to the burner, is perfectly devoid of colour, and invisible. _a_ is a glass vessel furnished at its orifice with a brass cap, _c_, and perforated ball, out of which the gas-flame proceeds. _b_, the pipe which conveys the gas into the glass vessel, _a_.