Advice note from University of Cambridge, regarding two papers 'The diffraction of sound pulses III. Note on an integral occurring in the theory of diffraction by a semi-infinite screen' and 'The diffraction of sound pulses IV. On a paradox in the theory of reflexion' by Frederick Gerard Friedlander Sectional Committee: Physics 20 copies of the paper sent by Registered Parcel Post. Appended list of recipients for the 20 copies, including Geoffrey Ingram Taylor, Frederick Gerard Friedlander, Herbert John Gough and the Royal Society. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on recto as received 18 December 1942. 17 December 1942