Have you ever noticed the plaque on the Hotel Monaco (7th Street, between E and F Streets) about Samuel F.B. Morse? In 1845, Samuel F.B. Morse opened and operated the first public telegraph office on that very site. While most people know Morse for his association with the invention of the telegraph and, or course, the Morse Code, he was also an incredibly accomplished painter. For any of you who have read “The Greater Journey: Americans in Paris,” he is one of the figures David McCullough discusses. One of Morse’s most ambitious works, “Gallery of the Louvre,” was recently on special exhibit at the National Gallery of Art (6th and Constitution Ave. NW).