# Spark-Ignition Tube
**[](https://stanslegacy.com/uploads/images/gallery/2023-12/KR9aOEnHP6CLPl17-image-1702961637525-53-54.png)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).
[](https://stanslegacy.com/uploads/images/gallery/2023-12/Mw6PFaxapv0ewddx-image-1702961644787-54-02.png)
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.