This "Liberty Bell" is considered to be the forerunner of all modern American slot machines as its basic design continues to be used in mechanical gaming devices today. The simple mechanical devices with three old-style reels holding 20 symbols have evolved into microprocessor-controlled devices with up to five spinning reels holding hundreds of symbols. It was during the 1930's that slot machines began to proliferate across America, and in the late 40's Bugsy Siegel added machines to his Flamingo Hilton hotel in Las Vegas.

Robinson was aboard the John Hawkes trained silent Song in the Bamford Association Lawyers Handicap (1400m) won by stablemate Contrast, ridden by Sydney’s leading rider Darren Beadman. Chief steward Ray Murrihy questioned Robinson about his decision to go for home before acceptances. Robinson took Silent Song to the lead from race favourite Palabiro at the 600m mark.