[Trinity House embossed letter head]
My dear Sir
By direction of the Deputy Master1 I send enclosed the specification for the Gibraltar Light Apparatus, with his request that you will be so good as to fill in the number of millimetres for the Sea Horizon2.-
I shall feel obliged by Your returning me the enclosed & am always
most faithfully | George Herbert
Trinity House. | 2 April 1863
Professor Faraday F.R.S. | &c &c &c
Please cite as “Faraday4319,” in Ɛpsilon: The Michael Faraday Collection accessed on