When he used an icebox of his own design to transport his butter to market, he found that customers would pass up the rapidly melting stuff in the tubs of his competitors to pay a premium price for his butter, still fresh and hard in neat, one-pound bricks. ”可见，Thomas Moore因发明了冰箱来储存他的黄油，为他获得了更高的利润

呵呵，这是原文，这样看就明白一点了