Armand Masselin to Faraday   8 October 1859

Glass Works near Birmingham | October 8 - 1859

Dear Sir

We forwarded to you yesterday in our letter¹ in answer to your questions concerning Second order Lights, two tracings of the Sections of the 12 & 5 & 16 & 6 Lights². These tracings were the only ones we had by us then, but it occurred to us since that you might have to deliver in the hands of Trinity House these 2 tracings & that from there they might accidentally happen to fall in the hands of our foreign Competitors - as the 16 & 6 Prisms Section recently Calculated here by Mr James T. Chance may justly be considered our private property we should prefer that this Section with the Complete measurements should not be delivered to the Trinity House. On Monday³ therefore we will send you two similar tracings but with only a portion of the measurements.

If however you felt it absolutely necessary that the drawing Complete should be delivered to the Trinity House, of course we should submit to it[.]

We Remain Dear Sir | Yours faithfully | Chance Bros & Co | Per. A. Masselin

Professor Faraday &c &c.