Dunlop and Rumker worked for Brisbane at the Parramatta Observatory.
They were not good friends.
You can read about them here:
Dunlop, James (1793 - 1848)
http://www.adb.online.anu.edu.au/biogs/A010322b.htm
http://www.austehc.unimelb.edu.au/fam/1527.html
Rümker, Charles (1788 - 1862)
On his grave his widow calls him Charles Louis Christian Rumker.
http://www.adb.online.anu.edu.au/biogs/A020359b.htm
http://www.austehc.unimelb.edu.au/fam/1524.html
Here are some photos that I took in Australia, when I visited Scotland in 1998, and in Portugal this year.
http://picasaweb.google.com/dunlop1826/DunlopRumker
We cleaned Rumker's grave up a bit so we could read it.
James Dunlop’s made
A Catalogue of Nebulae and Clusters of Stars in the Southern Hemisphere observed in New South Wales
from his Parramatta house in 1826. One hundred of the 629 objects in that catalogue are listed at:
http://www.seds.org/messier/xtra/similar/dunlop.html
Descriptions of all 629 objects are at:
http://www.ngcic.org/Historical_Record/default.htm
There is an article about Dunlop in S&T.
James Dunlop: Messier of the Southern Sky. Sky &
Telescope, June 2001, p. 112-116
Information by Andrew James on Dunlop's double stars is at:
http://homepage.mac.com/andjames/Page034.htm