http://transits.mhs.ox.ac.uk/contribute/record.php?recnum=6&link_id=&compiled_name=MuseumBoerhaave&searchterm=&view=&contributor_id=56

"the mirror in the back of your mind" replies BI ONLINE....go figure:

http://transits.mhs.ox.ac.uk/contribute/record.php?recnum=4&link_id=&compiled_name=MuseumBoerhaave&size=big&searchterm=&view=&contributor_id=56

and I wonder if emet had wanted to remember the following?

This is one of the three heliotropes made by the instrumentmakers of the Leiden Observatory.

Leiden Observatory instrumentmakers, Leiden, 1873

Museum Boerhaave V13161