The Adler Planetarium, Grant Park, Chicago. The $1000000 Adler Planetarium comprising an observatory and astronomical museum is at the north end of the lake front island off Roosevelt Road. One of the features of the planetarium is the $90000 Zeiss projector built in Jena, Germany. This instrument reflects the planets and stars on a vaulted dome. An audience of several hundred will be seated comfortably in this lecture hall."