Note re 7CH FD photo and 7DX log for Sun 21 Dec 1930?

       A copy of a photo of 7CH's labeled on the back "E.Byfield, 
       W.Masters, C.Harrisson" and a page of 7DX's log about the 
       1930 Field Day.

       Note in log extract:
       Call sign XVK7WI, the X indicating portable operation
       Code words for verification of reception
       Automatic morse sent with gadget made from gramophone -
         Chas 7CH (nearest camera) says this was not a great success 
         due to the effort required to wind it up every few minutes
       Togetherness required when two people share one pair of 
         headphones
       Aerial current as measure of transmitter effectiveness
       Watty (7DX) unwell (he died in 1931 aged 33)