Recently I was doing some research online for information regarding the history of the Singer model 237 sewing machine. A wonderful place for sewing machine info is ISMACS - The International Sewing Machine Collector's Society.  While looking through their pages, I found a link to a manual that I had been unable to find before - to a Military manual on repairing and maintaining sewing machines.

ISMACS Main Site

ISMACS Research Page

Military Manual Chapter 4  - pages 51 and 57 (top right navigation) have info on Singer 31-15

Military Manual Chapter 9

For many Veterans, PTSD or other traumas change their lives.  Susan Boyle echoes this type of change in her rendition of "I Dreamed A Dream" from Les Miserables

Susan Boyle "I Dreamed a Dream"