|Alternative reference number||NLB/42 p249|
|Title||Copy letter from Robert William Frederick Harrison to W Geoffrey Duffield, DSc, Physical Laboratories, University, Machester|
|Date||4 June 1910|
|Description||'Dear Sir, |
In accordance with your request, I herewith return your Paper for the purpose mentioned in your letter. I should be much obliged by your returning it here at the earliest possible moment.'