Royal Institution | 8 May 1858
Sir
In reference to your letter of the 5th instant1 regarding the red light at the entrance of the river Garonne I have received no account of that light nor of its superiority over others. Not being aware of its construction either as regards the source of the light or the means employed to render the ray, red;- having indeed no data upon which to found any consideration, - I am unable to form an opinion respecting it relative to other red lights or indeed of the light itself2.
I am Sir | Your very faithful Servant | M. Faraday
P.H. Berthon Esqr | &c &c &c | Trinity House
Please cite as “Faraday3432,” in Ɛpsilon: The Michael Faraday Collection accessed on 28 April 2024, https://epsilon.ac.uk/view/faraday/letters/Faraday3432