Dalén light

[1] Gustaf Dalén invented a valve which could be adjusted to deliver pulses of acetylene into the lamp.

[2] The pattern of flashes (known as the light's characteristic) can be set by screw adjustments.

[3] The invention of this system resulted in Dalén being awarded the 1912 Nobel Prize in Physics.

[3] Gas was wasted however due to illumination during the day and subsequently Dalén developed the sun valve to shut off the flashes during daylight.

[4] Dalén later invented the AGA cooker in 1922 whilst recuperating from an accident with acetylene which blinded him.