Green’s Dictionary of Slang

slater’s pan n.

[proper name Slater, the deputy provost-marshal in Grose’s era; given the heat of the West Indies, prisoners were presumably ‘cooked’ in the ‘pan’]

the prison at Kingston, Jamaica.

[UK]Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.