Copy letter from an unknown correspondent, to the publisher of the 'Electrician', Salisbury Court, Fleet Street The Royal Society's blocks are never lent but the publishers can have a cliché at their own expense of figure seven of the recent electrometer paper by Professors Ayrton, Perry & Sumpner, 'Philosophical Transactions of the Royal Society', 1891, page 548, for which Sumpner has applied. 11 April 1892