old16a.jpg
Extreme right portion added in 1869 to house the 8 1/2-inch Piston-Martius transit Circle
Smaller section was used as a clock room
Portion immediately next to the main building housed first the Mural guide (1844-1845), then the transit instrument (5.3-inch) (1845-1864), then the 8.5-inch transit circle (1865-1870), and finally the library
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