Zaalberg van Zelst, G. J. & Matla, J. L. W. P.,
Experimenteel Physisch-Psychologisch Laboratorium, Den Haag [Netherlands]
Alfred Russel Wallace
Old Orchard, Broadstone, Dorset
6 May 1911.
Note: This item includes an envelope. G. J. Zaalberg van Zelst and J. L. W. P. Matla were Dutch physicists who developed the dynamistograph, an instrument said to have been constructed under spirit guidance to obtain direct communication with the spirit world without using a medium. Source: var. internet, TBC
British Library, The
BL Add. 46439 ff. 396
Copyright of the Zaalberg van Zelst, G. J. & Matla, J. L. W. P. Literary Estate.