Last night I posted an article about an early (1902-3) British submarine which contains a couple of terms I'm not familiar with, since I don't know much about the technology.http://www.livejournal.com/users/ffutures/114254.html#cutid1
It mentions three types of torpedo carried by the sub; an "aerial torpedo" fired by compressed air when the sub is surfaced, another "for using beneath the water", and a
"Whitehead". I'd like to add a glossary explaining what these did, and what the differences between the three types were, since it isn't very clear.
If possible I'd also like to identify the sub, which was 118 x 9 feet externally, had electric and petrol engines, and a claimed range on electric motors of 100 miles.