Gas and Oil Engines, Simply Explained

by Walter Runciman

Excerpt: ... one, marked A in fig. 18, is a perfectly cold part of the flame, and appears to be a pale-blue coloured cone. It is the outer zone which is the hot portion of the flame, hence this part only must be allowed to play on the tube. The tip of the blue cone A must be kept about 1 4 in. below the tube, in order to ensure the hottest part of the flame impinging precisely where the heat is required. The total length of the whole flame is, to a certain extent, immaterial; but, generally speaking, it should be adjusted so that the length of the inner cone A is about 1 in. or 1- 1 4 in. The same methods which we described in the early part of this chapter can be employed in the adjustment of this burner, but some care should be exercised to get the correct flame length. The result of allowing the cold part of the flame to impinge on the tube is observable in fig. 18. The black spot indicated on the drawing actually appears as a black or sooty spot when looking at the tube under these conditions; but in reality no discoloration whatever takes place, the spot Pg 44 disappearing immediately the cone A is made shorter, or the burner H lowered in the chimney B, so that the tip of A is just below, and does not touch the tube at all. The adjustment of the length of cone A may be accomplished in two ways

76 pages, Paperback

First published October 4, 2009