To George Biddell Airy   13th Sept 1851¹

Queenwood Stockbridge | 13^th Sept. 1851

Sir.

I was induced to address you² because I knew that you were a physicist as well as an astronomer. I have now to return you my sincere thanks for the kind permission which you have granted me.³ Even should you never be referred to in connexion with the subject on which I have presumed to address you, it remains a fact full of encouragement and pleasure to me to know that I have been fortunate enough to secure the favourable opinion of an authority so exalted.

I am Sir | Your obliged & humble servant | John Tyndall

Prof. Airy | &c &c

RGO MS.RGO 6/373.413