Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to H. E. Wimperis, Esq., Air Ministry, Kingsway, WC2 Gives thanks for offering to exhibit the small vertical wind tunnel again for the 24 June [Ladies] Soiree. States it was popular although difficult and heavy for the men to carry the required machine up the stairs. Asks for the equipment to be sent early and with additional men to carry the equipment. 2 June 1931