Slit width adjustable by micrometer screw, calibrated 0-50 x 0.01mm. Slit length adjustable V slider, calibrated 0-18mm. 28mm tube fitting with locking screws. Adam Hilger Limited. Hilger Adjustable Slit
Two .001mm slits in silvering on small glass slips 2 x 6mm for variable density recording. Slits for Optical Sound Recording
