Green’s Dictionary of Slang

salamander n.

[SE salamander, a mythical lizard-like animal, once thought to be capable of living in fire; Williams notes that it was used in the 17C to invoke sexual coldness (i.e. the cold-blooded lizard)]

1. a fire-eating juggler.

[UK]D. Jerrold Men of Character I 77: Job was not a salamander; a red hot spark from the blazing wood had inopportunely lighted on his cheek.
[UK]Hotten Dict. of Modern Sl. etc. 204: salamanders street acrobats and jugglers who eat fire.
[UK]Sl. Dict.
W. Besant Children of Gibeon (2001) 74: We ain’t a show. Lotty ain’t a clown; I ain’t a jumping-horse; Liz ain’t a salamander.

2. (Aus.) a fireman.

[Aus]Sun. Times (Perth) 26 Aug. 1/1: An attempted jewel robbery by drinken firemen has been hushed up [and] the advent of the John disturbed the shickered Salamanders in their felony.