Show changes in united states capitol capital in 1864 congress transformed the old house wing of the capitol into statuary hall on december 2 1863 a patriotic crowd assembled to wit ness the placing of thomas crawford s statue of freedom on the top of the dome when the field battery fired the national sal salute ute a at t noon the capitol was complete in its main lines subsequently minor renovations were made to permit the introduction of steam heating 1865 elevators 1874 fireproof ing 1881 electric lighting 1882 modern drainage system 1893 and air conditioning 1937 |