well, according to Milton Friedman( famous economist and Ben Bernanke( head of Federal Reserve system) we were not on a true gold standard in 1929, but what do they know?
According to them, and what do they know, there were tremendous bank runs back in the day such that about 1/3 of the money supply and 1/3 of the banks disappeared. On a true gold standard, they say, the Fed would have issued new money again to maintain a supply equal to the gold supply which had not disappeared, thus avoiding the liberal Great Depression.