A microscope, with coordinate motions of 21×15 cm which may be used in the analysis of large nuclear plates is described with particular attention given to constructional details. The design includes a magnetic clutch for fixing plate position, a rotating super‐stage and dial indicators to observe both horizontal and vertical movement. A stage noise D̄noise≦0.029 μ for cell lengths up to 1 mm was obtained.

1.
G. T.
Zorn
,
Rev. Sci. Instr.
27
,
628
(
1956
).
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2.
For comparative measurements on other scattering microscopes, see reference 1. In comparing these results one should note the difference in the average reading error which has been reduced in our case to about 0.02μ.
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© 1958 The American Institute of Physics.
1958
The American Institute of Physics
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