CIRCUIT STAGE VAN HEURCK MICROSCOPE (Holos Oil Immersion Condenser)

This (later version) of the 'Holoscopic Oil Immersion Condenser' is suitable for use with the highest power objectives and has an immersion front which may be removed for use with dry objectives of medium to high power. It is signed: 'HOLOS OIL IMM CONDENSER   5.5 mm     n.a. 1.30   WATSON   K5463'. This condenser fits the same condenser housing as the 'Universal' Condenser, but also fits another housing it is pictured with, using a brass adapter; a similar adapter is used to fit another unsigned (likely Abbe) condenser to the same mount. The earlier version of the Holos Oil immersion condenser with my Grand Van Heurck microscope has a smaller diameter and fits a different mount. Both condenser mounts have a nice iris diaphragm and a swing-out filter/dark-ground-stop holder, each of diameter suitable for their different condenser sizes. A different set of stops is needed for each, although a a Traviss Stop can be substituted for many of the various fixed dark ground stops for the older model of Holos oil immersion condenser.