An Abbe refractometer marked “Warren P. Valentine, No. 360, Philadelphia” . The silvered scale on the sector is marked from 1.300 to 1.700. The all brass stand is finished in black enamel. This instrument is not a user item. The upper prism is cracked, as is the glass scale window on the movable arm. Also, one coolent nipple is missing as is a locking knob on the arm. The original wood case is included.
the prism holder
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