Letter from Llewelyn Southworth Lloyd, Department of Scientific and Industrial Research, 15 Great George Street, Westminster, to the Secretaries of the Royal Society The Advisory Council has received an application for a grant for research into important physical constants. They are of the opinion that the time has come to determine what further work on physical constants might usefully be done at the National Physical Laboratory, and if other investigators were to be assisted, it should be as part of a coordinated programme. The Council requests the assistance of the Physics Committee of the Royal Society for advice on which constants should be researched and in what order. 7 May 1919