He made a trip to Britain and the United States in 1897, taking along his former household servant, John Chilembwe. Chilembwe stayed in Virginia to study as a Baptist pastor and later returned to Nyasaland where he founded the Providence Industrial Mission , following the model set by Booth's industrial missions, and led the Chilembwe uprising in 1915. By 1898, Booth had become a convinced Sabbatarian, which became one of the guiding principles for the rest of his life, and he turned to the Seventh Day Baptists to support his missionary activities. Booth returned to Central Africa in 1899 and established the Plainfield Industrial Mission in Thyolo District for the Seventh Day Baptists. This was named after the Plainfield Seventh Day Baptist Church in New Jersey which had funded it. In 1900 Booth succeeded in establishing a short-lived institute to produce African leaders for the Seventh Day Baptist Church. Two years later, the institute was discontinued, although Booth pointed out that the existing elementary schools could not produce African pastors, and the production of African church leaders was essential to promoting African development.