|Alternative reference number||NLB/72 p72|
|Title||Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Director of the National Physical Laboratory|
|Date||17 April 1929|
|Description||Informs the Director that the Royal Society would be pleased to have the following exhibits offered for the May Soiree:|
1. Flutter of model aeroplane wings by Mr Frazer and Mr Duncan
2. Measuring thickness of films by Mr Rolt and Mr Barell
3. (a) Manganese and (b) Age-hardening of aluminium alloys by Dr Gayler and Mr Preston.