Abstract
A spring layout is described for producing symmetrical movement in an optical slit 10 cm long, and capable of operating at any width between 5 and 1000 μ. Such factors as the parallelism and separation of the jaws are made independent of gravity by suitable arrangement of spring strength and disposition of centres of gravity of the moving members. The jaw edges are optically worked to confine width variations along the slit to about ±0.15 μ r.m.s., and the jaws can be set parallel by eye and hand to within about 0.3 μ variation in the 10 cm length.
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