Faraday to William Barchard   3 April 1849¹

Royal Institution | 3 April 1849

Sir

By desire of the Trinity house authorities² I have to request you will be good enough to send answers to the enclosed questions + addressed to me Royal Institution Albemarle St. with any other information relating to the action of the ventilating pipes

I am Sir | Your &c | M. Faraday

Mr Wm Barchard | Needles lighthouse | near Fresh Water | Isle of Wight

+ as above³