Green’s Dictionary of Slang

nosey bob n.

[R.R. Howard (c.1836–1906) the New South Wales hangman from c.1874–1904; he earned his nickname from a facial disfigurement]
(Aus.)

1. a hangman.

[Aus]Dead Bird (Sydney) 20 July 3/4: A ‘dull, sickening thud,’ as they say when Nosey Bob drops a criminal off.
[Aus]Truth (Sydney) 14 Jan. 4/5: George Archer, who was hanged for the murder of Miss Harrison [...] had been shot into Eternity by ‘Nosey Bob’.
[Aus]Bulletin (Sydney) 16 Jun. 21/1: Despite the probability that the death-sentence will be commuted in the case of the youth Murphy, lately convicted in Sydney of murder, the fitness of the ancient Nosey Bob to continue as official man-butcher is again called in question. Nosey is not particularly anxious to hold on, but wants a pension on retirement, ‘like any other civil servent.’.
[Aus]Bulletin (Sydney) 27 Sept. 29/1: [A]s the bolt of the drop was stiff [...] ‘Nosey Bob,’ the hangman, had to use a sledge-hammer and much force.
[Aus]Sun. Times (Perth) 24 Dec. 4/8: I though I got five-fifty a year for finding a ‘Nosey Bob.’ / For hiring a Ketch or a Calcraft, Tommy, a Billington or Binns.
[Aus]Bulletin (Sydney) 24 Dec. 44/3: ’E showed ’em ’ow to pass out, ’e did. ‘Swing ’er off, yer cow,’ he says to Nosey Bob when the noose wuz put round his neck.

2. an inquisitive person, a ‘nosey parker’.

Listening Post (Perth) 24 Jan. 23: I suggest that space be devoted to the ‘nosey bobs’.