Copy letter from Herbert Rix, to A G Jeffreys, Woodridings, Pinner 'Dear Mr Jeffreys, I am pleased to testify that during the last eighteen months, besides having a general superintendence of our electrical plant, under the direction of Messrs Drake & Gorham, you have several times helped us on special occassions in preparing for electrical demonstrations, and in the management of our electrical demonstrations, and in the management of our electric lantern, and that we have found you capable and efficient. I am, yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 29 May 1894