Pendulum Observations in London

Abstract

THE reference by the President of the Royal Society in his recent annual address to the subject of contemplated pendulum operations permits me to assume that enough interest exists in those operations to render the offer which I now wish, with your kind assistance, to make, not altogether inopportune. I am now engaged in swinging pendulums, in London, under conditions which enable me to invite any person who may wish to make themselves acquainted with the modus operandi by actual inspection, to come and witness the same. The only formality I would impose is the communication of the visitor's card and address, and a few hours’ notice, in case the intended visit should promise to be inopportune. To reduce the likelihood of this I would intimate that the regular observations are made (in the present case) within about half an hour before and after the hours of six and twelve, morning, noon, evening, and midnight, during which the attention of the observer may be understood to be entirely preoccupied. At any other hour of the day or night, either I or my assistant will be desirous of explaining to the best cf our ability whatever may be needful.