Crawford burner
（重定向自Strand burner）
A Crawford burner is a device used to test burn rate (chemistry) of solid propellants. It is also known as a strand burner.
A Crawford burner consists of a small pressure vessel in which a thin bar of propellant to be tested is mounted on a stand. The bar is coated with an external coating so that burning cross-sectional surface is restricted. The propellant is ignited at one end and burned to the other end. Wires are embedded in the propellant at certain intervals of distance so that when the propellant burning reaches the wire, it sends off electrical signals. These wires are connected to a chronometer and the electrical signals are recorded at different time intervals so that burning rate can be measured.