Josiah Latimer Clark to Faraday   5 June 1854

448 West Strand | June 5th 1854

Dear Sir

“We have had Express (underground wire) needles demagnetised and underground Tunnel circuits fused during the last week”.

The above is an extract from a letter from one of our Superintendents dated 1st June. It seems a very strange fact but I have no doubt of its truth. I attribute it to the inductive effect of lightning in the vicinity of our underground circuits. The London and North Western is the District referred to.

Yours very truly | (signed) Latimer Clark

Professor Faraday,