Method for micro-puncturing the photographic discs of stars on plates to obtain their optical centres for purposes of measurement

TL;DRAbstract

On photographs which have been taken with long exposures the stellar images are large, so that a considerable amount of uncertainty is involved in bisecting them with accuracy when measuring position angles of and distances between such stars; and the method of making several measurements and resetting the instrument for each one in order to obtain a mean position for the centre is troublesome. But if with a fine needle point the centre of the photographic disc could be accurately punctured, one careful measurement made from such a well-defined centre point would be more reliable than the mean of several approximate measurements.

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