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Objective, 8mm, holoscopic, in cannister, by W. Watson and Sons Ltd., 313 High Holborn, London, England.

Objective, 8mm

Objective, immersion, 1/15inch ?, aperture 1.24, in cannister

Objective in cannister

Objective, holoscopic, 12mm. in cannister, W. Watson & Sons Limited, 313 High Holborn, London, England.

Objective, holoscopic, 12mm. in cannister

Objective, 1/2 inch, in cannister, having correction collar and cover slip adjustment

Objective, 1/2 inch