Jacob Herbert to Faraday   17 December 1846

Trinity House London | 17th Dec. 1846.

Sir,

The Board's attention having been directed to the short period, say about 12 months¹, in which the lower joints of the Tubes composing the ventilating apparatus for Argand Lamps become defective, and require renewal, I am to request that, you will give this subject your consideration, with the view of suggesting the use of some more durable metal than at present, in the manufacture of the said lower joints of such apparatus.

I am, | Sir, | Your most humble Servant | J. Herbert

M. Faraday Esq.

Address: M. Faraday Esq. | Royal Institution | Albemarle Street