COMPOSITION OF FURNACE GASES.
Considerable attention has been paid to the composition of the furnace gases from the tar fires. The slightest deficiency in the air supply, of course, results in the immediate production of smoke, so that the damper must be set to provide always a sufficient air supply. Under these circumstances of damper, the following analyses of combustion gases from tar fires have been obtained:
No Smoke.
CO₂. O. CO.
11.7 5.0 Not determined.
13.3 3.7 "
10.8 5.4 "
14.8 2.5 "
13.5 3.0 "
12.4 5.6 "
12.4 4.6 "
13.1 5.9 "
15.3 1.0 "
10.8 4.0 "
14.0 2.8 "
______ ______
Average 12.9 3.9
(11 analyses) ______ ______
11.5 Not determined.
14.3 "
14.6 "
Damper adjusted so that a slight smoke was observable in the combustion gases.
CO₂. O. CO.
17.30 None. Not determined.
16.60 " "
16.50 0.1 "
15.80 0.1 "
16.20 1.8 0.7
_______ _____ _____
Average 16.48 0.4 0.7
—Gas Engineer.
A NEW MERCURY PUMP.
The mercury pumps now in use, whether those of Geissler, Alvergniat, Toepler, or Sprengel, although possessed of considerable advantages, have also serious defects. For instance, Geissler's pump requires a considerable number of taps, that of Alvergniat and Toepler is very fragile in consequence of its complicated system of tubes connected together, and that of Sprengel is only suitable for certain purposes.