Tuesday 9 July 2024

The Kodailkanal Observatory in India and a Cooke telescope

 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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