A direct-reading measuring microscope

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Abstract
The article describes a travelling microscope designed for measuring by direct readings Debye-Scherrer X-ray powder photographs. With this instrument measurements are made by direct reference to a glass scale which can be traversed, together with the photographic film, beneath a low-power microscope in which both the scale and film can be viewed together. A fixed vernier also of glass is viewed at the same time and readings may be made to 0.01 mm. The scale and film are traversed by hand enabling rapid movements to be made throughout the length of the film. A fine traverse is provided for adjusting the film image to the cross-wire in the microscope.

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