Copy letter from Herbert Rix, to Messrs R & F W Thomas, 6 High Street, Acton, W. 'Dear Sirs, In answer to your memorandum of the 8th inst. [instant], I have the pleasure to inform you that the President and Council have granted you leave to "photograph instruments, etc., used by Sir Isaac Newton and others" to form a series of lantern slides for educational purposes. I am, yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 25 January 1894