From John Barlow   oct 21/52

Royal Institution | Albemarle S^t | oct^r 21/52

My dear Sir

Our friend D^r Bence Jones has given us hopes that you may be prevailed on to be one of those to whose free kindness we are indebted for our Friday evenings.¹

The subject which you are likely to take is an excellent one for our audience and we have the same electro-magnet with which D^r Faraday rotated a ray of light & established diamagnetism. – It is half the ‘mooring’ of an Indiaman²

Perhaps you would tell me at your convenience whether a Friday in Feb^y or March would suit you –

Ever truly yours | John Barlow

J. Tyndall E^{[sq] 3}

RI MS JT/1/B/21