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by Eddington ( R.A.S., M.N. ) and Dyson
( R.S.E. Proc. ).
Photography promises to assist in the
measurement of parallax and proper mo-
tions. Herr Pulfrich, of the firm of Carl
Zeiss, has vastly extended the applications
of stereoscopic vision to astronomy–a sub-
ject which De la Rue took up in the early
days of photography. He has made a stereo-
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