Correspondence and papers from a folder labelled 'Pic du Midi IV'. Letters between ZK and Professor Jean du Rösch (typescript and manuscript), Director of the Observatoires du Pic du Midi et de Toulouse. Correspondence includes: Grubb Parsons; Duncan Dale's accident; quotations and specifications for new optical equipment including mirrors and oscillator; Rösch's visit to Manchester; 42-inch telescope; issues with mirror thickness; visits from Majors Fredericks and Captain J.D. Perkins of the United States Air force (USAF), Brussels, Belgium; ZK's appointment as President of the Fondation Internationale du Pic du Midi (FIPM); T.W. Rackham's notes regarding questions raised by Rösch; notes, 'Definition of the nature of M. Le Pouriel's work at Pic du Midi; Bagnères conference; USAF funding; and engaging M. R. Le Pouriel at Pic du Midi.
The Observatoire du Pic du Midi (established 1878) is an astronomical observatory located at 2877 meters on top of the Pic du Midi de Bigorre mountain in the French Pyrenees. ZK conducted his Lunar Programme work here, using the 2 foot in diameter refracting telescope which had a sufficiently long focal length of 60 foot to produce high quality images for lunar mapping.