Letter from [Alan Archibald Campbell] Swinton, to D. N. Sharma, 108 St. Pauls Road, London, N. W. 1. Regrets that there is no evidence that what is claimed in Sharma's Provisional Patent Specification can be done. Unwilling to support a Patent in which there is no evidence that the scheme therein will work and can therefore assist him no further, returning herewith Sharma's Patent Office receipt of 2 October 1926, for his provisional protection, and the diagram of the apparatus, and descriptive documents, that were left with him. 17 May 1929