NELSON 1A MICROSCOPE

MAKER:Charles Baker Company

MODEL:'Nelson-Curties No 1a' or 'Nelson-Curties No 1A'

c.1900

WATSON HOLOS IMMERSION CONDENSER AND CONDENSER HOUSING

CONDENSER SERIAL NUMBER: 3780

This is a Watson condenser housing into which a Watson Holos Oil Immersion condenser (NA 1.30) with removable immersion front is shown installed. This condenser housing has a single small swing-out insert/filter holder with a knurled ring to rotate the inserts. It will also accept other RMS fitting condensers. High quality features include the facility to adjust the centration of the filter holder and calibration of the iris diaphragm adjustment for numerical aperture with an arrow on the lever to point to the engraved n.a. on the condenser housing. The condenser housing is signed W. Watson & Sons Ltd London. The condenser itself is signed HOLOSCOPIC OIL IMMERSION CONDENSER, W.Watson & Sons Ltd 1.30 n.a., 3780.