----------------------------Original message---------------------------- For those of you who may be in the Boston/Cambridge area in the next month you may be interested in the following exhibit: From An Art To A Science Navigation in an Age of Exploration and Discovery. It will open today and be available until the 24th of Novemb. The exhibit includes materials from the Harvard Collection of Scientific Instruments, the Houghton Library, and the Harvard Map Collection. Scheduled to coincide with The Longitude Symposium here at Harvard the exhibit features two of Mercator's globes (1541 and 1551) from the Harvard Map Collection, a portulan atlas, the first printed portulan sea chart, several works on navigation including those of John Harrison, and numerous scientific instruments. David A. Cobb Harvard Map Collection