Letter from H L [Hugh Longbourne] Callendar, 49 Grange Road, Ealing, London, to [Joseph] Larmor Discussing the recreation of past experiments: Callendar writes that he would not think this worthwhile 'unless of great historical interest for a biography'. He adds that 'I don't think any comparisons made now could correct experiments made 40 years ago, as all the data could not be recoverable'. He notes that the attempts of others to correct [Henri Victor] Regnault 'have resulted in dismal failure'. 10 March 1910