This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
The roaring of a gas fire is generally due to some roughness in the interior of the burner, caused either by a burr in the tube or by an accumulation of deposit, the result of the burner firing back. This is often found to be a source of the trouble.
 
Continue to: