Letter from Horace T [Tabberer] Brown, 52 Nevern Square, Kensington, to [Joseph] Larmor He is glad that Larmor spotted errors in the formula for tube and septum. The experimental results are in close constanance. The holes have little interference with each other if further apart than 8 diameters. He cannot follow all of Larmor's recent developments of the problem, but Brown has corrected the most obvious errors in his own statements, leaving the theoretical part to others. He will do more experiment next winter, but now he must spend time on the plant, and he thanks Larmor. In an early letter Larmor made a suggestion about a disc with adjustable sectors and this has resulted in Brown having apparatus made by the Cambridge Instrument Company. 27 May 1900