Spark-Ignition Tube Spark-Ignition Tube (B) is a tubular test apparatus (1/8 diameter) that determines and measures the " Burn-Rate " of different types of Burnable Gases intermixed with Ambient Air, as illustrated in Figure (2-1). Spark-Igniter (A) causes and starts the Burnable Gas-Mixture (B) to undergo Gas-Ignition which, in turns, supports and allows Gas Combustion to take place ... forming and sustaining a Gas-Flame . The expanding and moving Gas-Flame travels (away from spark-igniter) the linear length of the gas filled tube (C) and is " detected " and " measured " (length between spark-igniter and light-detector) in one second after gas-ignition. The Gas-Ignition Process, now, establishes the " Burn-Rate " of a Burnable Gas-Mixture in centimeters per second (cm/sec.), as illustrated in Figure (2-2). Different types of " Burnable " Gas-Mixtures exposed to the Gas-Ignition Process were tested, measured, recorded and systematically arranged as to cm/sec. length, see vertical bar Graph (2-2) again. The Gas-Ignition Process was performed several times to establish the "average" Burn-Rate of the Fuel-Gases which, in turn, establishes the length of the vertical bars.