Engraving of Herring's Safe Containing Specimens of Gold, by Unknown, 1886, Smithsonian Archives - History Div, Illustration (Fig. 5) in "A Handbook to the National Museum under the direction of the Smithsonian Institution, Washington" of a mother and child looking at a popular exhibit of some thousands of dollars worth of gold in dust, scales, flakes, nuggets and bars, and native silver which are behind glass safely stored in a Herrings' safe where they are protected from theft, yet may be well seen. The metallurgy exhibit demonstrated how man worked metals from ores. The ores were gathered mostly by agents of the Tenth Census, and represented fully all the districts of the west where the precious metals were mined..