http://www.rockislandauction.com/viewitem/aid/66/lid/3596

Along with his two semiauto rifle prototypes, when White went to England for rifle testing he took along a work-in-progress light machine gun. The weapon was trsted by British officials, but found wanting - largely because it was really not a weapon ready for testing. The "LMG" White built was actually semiautomatic only, although it fired from an open bolt. It used what appears to be an early iteration of the gas system which was much more refined in his selfloading rifle, and it included no provision for using a bipod or tripod (an essential element of a light machine gun).