The Kodailkanal Solar Physics Observatory in southern India undertook much work studying the Sun. If possible it was photographed every day using the 6 inch Thomas Cooke &Sons telescope. On the same mounting is a small telescope used for projecting an 8 inch image on a chart on which can be marked the positions of the spots and faculae visible on the day of observation.
In a separate building was a Thomas Cooke & Sons 12 inch
photovisual telescope. Which is fixed horizontally and is supplied with
sunlight by an 18 inch siderostat. Between the siderostat mirror and the
photovisual can be placed other object glasses, which can be used to form solar
images for use with the large grating spectrograph, the collimator of which is
fixed horizontally at right angles to the beam of light from the siderostat.
The 12 inch Cooke forms an image of the Sun 60 mm in
diameter on the split platen of the spectroheliograph.
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