Whole British Nation in One Year!" Although this goal was not achieved, by the end of the year there were twice as many LDS Church members residing in Britain as in the United States. As a mission president, Pratt was admired by the missionaries for the many logical and well-written pamphlets he wrote and published while he was there and the way he communicated with British intellectuals to discuss theology. While presiding over this mission, Pratt received a pamphlet from Lorenzo Snow entitled "The voice of Joseph" that Snow wanted translated into French to advance his missionary efforts in northern Italy. Pratt managed to make contacts with people in Paris who were willing to do this translation. In 1865, Pratt was one of the first Mormon missionaries to work in Austria. Traveling with William W. Ritter, he was there for nine months, but did not baptize anyone. The missionaries were eventually expelled by the Austrian government. Migration west When news reached Pratt that the LDS Church was moving westward, he said, "We do not want one saint to be left in the United States." He helped lead the Saints "out of Babylon." Pratt was a member of Young's initial pioneer company, the "Vanguard Company", that crossed the plains to select a western site for Mormon colonization. His journals of this trip are an important Mormon history resource. As the group made their way from Missouri to Utah, Pratt acted as the company's scientific observer. He made regular readings with the company's scientific instruments, took notes on geological formations and mineral resources, and recorded information on plants and animals. He described snow on Laramie Peak on June 7, and noted that rock found on June 10, "would make excellent grindstones, being of fine grit sandstone." As a mathematician, Pratt assisted company scribe William Clayton in the design and invention of a version of the modern odometer. Intended to compute the distance traveled per day, the design consisted of a set of wooden cog wheels attached to the hub of a wagon wheel, with the mechanism "counting" the revolutions of the wheel. The apparatus, called the "roadometer", was built by carpenter Appleton Milo Harmon, and was first used on the morning of May 12, 1847. With Erastus Snow, Pratt entered the Salt Lake Valley on July 21, 1847, three days ahead of the main body of the Vanguard company. Several days later,