http://transits.mhs.ox.ac.uk/contribute/record.php?recnum=1&link_id=&compiled_name=MuseumBoerhaave&size=big&searchterm=&view=&contributor_id=56

or maybe it was 'this one' that he was after...more likely, I suppose...see previous post....go figure:

Frederik Kaiser, the director of the Leiden Observatory, had two models of the Venus transit made. These were used for training the observers, especially when Venus is entering the sun.

Willem Boosman, Amsterdam, 1873

Museum Boerhaave V13814 & V13841