 When the new observatory was constructed, the part that constituted the cone, clock room, and transit room were actually part of the original observatory, and those parts were moved to the new location for the construction of the new Laws Observatory on the north side of the Quadrangle in 1880.An office was added to the building in 1891, and classroom space was added in 1907.An R. Brown Gans-built 4½ inch equatorial refractor was also added to the observatory in 1907.