George Henry Bachhoffner to Faraday   28 August 1858

Royal Colosseum, | Regents Park & Albany Street, | London Augst. 28th 1858

Dear Sir,

I have again caused 10 cubic feet of coal gas to be pumped into the gas holder which produced the same elevation - viz - 10in within a fraction. I do not remember if I mentioned to you that the gas holder is not counter poised and must weigh with its gearing at least 3cwt - minus its loss by immersion in the water of the tank - and has to be lifted by the gas in addition to the 13in column head of water - these observations apply only to the coal gas holder, as I have no means of testing the oxygen gas holder in the same way.

I am, my dear Sir, | Yours faithfully, | Geo H. Bachhoffner

M. Faraday Esq D.C.L. F.R.S. &c.