A CONSIDERABLE volume of data on the strength of typical aircraft rivets in joints of Alclad (D.T.D. 390) sheet, has been published in the M.A.P.'s Scientific and Technical Memorandum series. The need for such an investigation arose from the use by the stress offices of different aircraft manufacturers, of strength figures which showed little unanimity even when identical riveted joints were compared. The result was that fixed conditions of manufacture; of the proportions of the joint; of methods of testing and finally of analysis led to a body of data which gives a fairly representative basis for practical design.