I have two torches, saw my dad use one once, never tried it myself. Makes a neat side collection, mine is oil cans. Many of the early engines were developed before Bosch developed the spark plug. Had an elderly car collector show me this stuff 40 years ago. The hot bulb was platinum I believe, and required heating up with the torch, then it would stay hot enough to provide ignition under compression stroke. Think hot bulb on old model air craft engines.
