Charles Rudy's 1854 Notebook with Trigonometry, Surveying & Astronomical Drawing, Lehigh Gap, PAI didn't know it when I found this, but its maker, Charles Rudy (b. 1837)the super bright and very entrepreneurial youngest child of Durs Rudy (a Swiss immigrant who kept a store and hotel, became an organist and was also, interestingly, a talented fraktur artist)would become quite a notable figure not just in Lehigh Valley, PA, where he grew up, but in Paris, where he established a school that became a hub for international nobility and the sons and