|Alternative reference number||NLB/73 p137|
|Title||Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Director, National Physical Laboratory|
|Date||25 April 1931|
|Description||Informs the Director of the National Physical Laboratory that space has been alloted to 3 exhibits for the 20 May  Soiree. Theses are;|
2- An autographic apparatus for determining Inflection Points in Magnetic Susceptibility Temperature Curves.
3- Photographs showing the application of the method of the X-Ray crystals analysis to industrial problems.