Fifty years later: 1929 and all that rememberedWithout hearing a word of what is being said or shouted, any experienced trader on the floor of the New York Stock Exchange can listen to the hum of voices around him and tell what is happening. An up market has a different pitch from a down market. But old Wall Street hands vividly remember an exception to that rule. One day 50 years ago next week, recalls David Granger, 76, a senior partner at Granger & Co., a Wall Street brokerage house, “there w...