Components of the "Optical Compendium"
A: Simple, hand-held magnifier with removable lenses. Shown with eyecup facing up above, and objectives facing up below left.
B: Body tube of the simple loupe-type magnifier. The lenses shown fit into the base of this section. Shown upright below right.
C: High magnification "Flea Microscope" with its specimen pin.
A: Simple magnifier with removable lenses. Objective lens facing up. The brass mount holds the single biconvex lens.