In this notice, Walker mentioned that Prism customs refuses drawbacks unless the contents are opened for identification wire instructions.

This fond is related to prisms from Kodaikanal Observatory

The letter is to Walker referring to D.O. 5934 regarding dark glasses. The letter states that he has never seen the eye-piece box as the wedge was satisfactory.

This letter was written to the Director, regretting that they cannot undertake to open the box at their risk, and also they are forwarding the case without opening it and are unable to get a drawback of 7/8 of the duty under the circumstances.

Letter to Shackleton to reorder a meniscus lens

This letter to Mr McDowell states Dr Pfund is now ruling gratings up to 4.5 in, and his diamond points do not last much longer than that. Hence, they are searching for others to rule out some big gratings from the beginning of next month. And this letter was copied to the Director General of Stores to do something needful about this problem, and they mentioned in their last reply letter due to some problem it was impossible to give delivery on time, but everything under their power was done, however, to furnish the grating and the first 6-inch plane ruled of first quality would be shipped.

This is a letter to Mr Bhaskaran from John Ebvershed about the receipt of the 12-inch lens after figuring out the back surface of the cookie, which was tested and seemed entirely satisfactory.

This letter is about photo-visual lens and lens for spectroheliograph for observation in Kashmir

The letter was written by Houghtons Ltd. to The Secretary of State for India in Council on the enquiry about the quality of the spectrograph slides being sent to Kodaikanal Observatory.

This letter is from W. G. Butler to the Director General of Observatories enquiring the details of the focal length, etc of a single lens, 4" aperture for Kodaikanal Observatory