The Five Colleges of Ohio Digital Exhibitions website is currently hosting an exhibit by Genevieve Senechal of Oberlin College entitled, "A Missionary in Siam." The subject of the exhibit is the life and word of the Rev. Dr. Dan Beach Bradley, the premier Protestant missionary in Siam in the nineteenth century. The exhibit includes photographs, including the unique family portrait on the life (taken in 1864 and including Rev. Daniel McGilvary), documents, historical sketches, and historical notes not only on Bradley but also on the nation of Siam during his lifetime.
The exhibit provides a good introduction to Bradley, to Protestant missions in Siam in his time, and to Siam generally in that era. It is worth spending a little time.