wrote in message
...
Whenever the launch is shown there is a shot of the exhaust coming out
of the rockets. And there is always in the shot a device that shoots
out sparks horizontally. What is the spark shower for?
Eric

Looks like an angle grinder, doesn't it. You need a reliable ignition source
before you turn the hydrogen on! I guess the oxygen goes on first, but
someone will be along in a minute with all the details.