sentences:  "Guide" made history during the voyage, becoming the first Coast and Geodetic Survey ship to use echo sounding to measure and record the depth of the sea at points along her course; she also measured water temperatures and took water samples so that the Scripps Institution for Biological Research (now the Scripps Institution of Oceanography) at La Jolla, California, could measure salinity levels.She also compared echo sounder soundings with those made by lead lines, discovering that using a single speed of sound through water, as had been the previous practice by those conducting echo sounding experiments, yielded acoustic depth-finding results that did not match the depths found by lead lines.She transited the Panama Canal on 8 December 1923.