Letter, from Humphrey Lloyd to Sir John Herschel, dated at Falmouth Autograph letter signed by sender. Thinks that there should be more definite instructions for the Directors of the Magnetical Observatories. Has drawn up a paper, which if John Frederick William Herschel agrees with, can be signed and printed for distribution. Points out the significant parts. There should be a common nomenclature for the weather. 21 August 1841