Copy letter from Robert William Frederick Harrison, to Professor Henry Selby Hele-Shaw, Fellow of the Royal Society Harrison apologises if his letter gave the impression that they were dismissive of his general demonstration, explaining that they were merely uncertain as to whether Hele-Shaw considered the Alexandra Palace experiments worth showing on the cinematograph, but as he does, they are happy to have them. He asks if he is to assume approval of his suggestion that Hele-Shaw share the operator with the anthropological films to be shown earlier in the evening. 23 April 1907