AUTOMATIC ALIGNING LIGHT, SHUTTER, AND PLATE RACKING CONTROLS FOR THE BAUSCH AND LOMB LARGE LITTROW SPECTROGRAPH
J Gillette · 1952
Automatically controlled shutter and plate racking mechanisms are de scribed.The shutter control may be operated manually by means of push button switches or automatically by means of a photoelectric tube circuit which is activated by light from the source.This photoelectric tube control system makes for more universal application since it is independent of the type of source.The plate racking may be controlled either manually or automatically at the end of the exposure cycle.The plate may be racked any pre-set distance between 2 and 6 mm consistently within 0.1 to 0.2 mm.The electrode alignment system, which is in line with the optical path, allows for continuous readjustment of electrode gap.Although, designed for the Bausch and Lomb Large Littrow Spectrograph, the mechanism could be adapted to most manually operated instruments.