(Peter Dolland)(John Dollond) , TL42401.1,” Harvard Art Museums collections online, Mar 27, 2023, https://hvrd.art/o/370665.
Reuse via IIIF
A brass mechanical instrument consisting of gears and spherical objects mounted to a circular chart. One large sphere sits in the center of the chart, with the remainder of the instrument connected to its base. One smaller sphere is positioned at an angle, while another is positioned upright next to it.