Faraday to H. Williamson   12 February 1839¹

R Institution | 12, Feby 1839

My dear Sir

I remember the experiment you refer to but I shall not be able to refer to that or to the many other oxy oil arrangements which have been placed before me[.] My subject will be treated not historically but practically & the practice will be simply of the last Gurney lamp²[.] Its comparison with other oxy oil lamps or with lime lights in reference to the points of light, expense, &c I shall not be able to make for they all seem very uncertain[.] The standard of comparison both for expence & light which I have taken is the oil Argand lamp and which I think is the best as being the most impartial standard for all other plans of producing light[.]

Ever Your Obliged Servant | M. Faraday

H. Williamson Esq | &c &c &c