![Acetylene signal lamp with heliograph attachment](https://coimages.sciencemuseumgroup.org.uk/359/458/large_smg00175944.jpg)
Acetylene signal lamp with heliograph attachment
Component of Acetylene signal lamp with heliograph attachmen made by E. R. Watts & Son, 1910. Metal box component with a small protruding element on top and the number 250 written on top. On one side there is a round section, with a metal fastner and a nozzle.