AVE8895367: 1960s: Rotating disc mirror and metal arrow sit on stands in optics laboratory. / Bridgeman Images

AVE8895369: 1960s: Exterior of large building in city. / Bridgeman Images

AVE8895375: 1960s: Men with Billy clubs and rifle run from gate of medieval houses. Woman stands at gate and watches angry men run across lawn. / Bridgeman Images

AVE8895376: 1960s: Grass field and bushes. Boy wearing tunic and hat walks up, stops and turns to look behind them. / Bridgeman Images

AVE8895384: 1960s: Two people in canoe go down river. / Bridgeman Images

AVE8895102: 1960s: Hands pick up books, set books on desk. / Bridgeman Images

AVE8895105: 1960s: Hands pick up books, set books on desk. / Bridgeman Images

AVE8895132: 1960s: Drawing of university buildings, men gathered. / Bridgeman Images

AVE8895133: 1960s: Interior of historical schoolhouse. / Bridgeman Images

AVE8895138: 1960s: Exterior of schoolhouse, flag waving. / Bridgeman Images

AVE8895141: 1960s: View of gate, pan to wall. / Bridgeman Images

AVE8895142: 1960s: Boy in period costume sitting with candle. / Bridgeman Images

AVE8895144: 1960s: Boy in period costume takes book from hand, reads from book. / Bridgeman Images

AVE8895151: 1960s: Boys in period costume working at desks, boy talking to man in background, walks to desk, man walks around room. / Bridgeman Images

AVE8895157: 1960s: Low angle of gate. / Bridgeman Images

AVE8895158: 1960s: Boys in period costume standing in line, man talking to boys. / Bridgeman Images

AVE8895160: 1960s: Boys in period costume with man, sit at desks. / Bridgeman Images

AVE8895161: 1960s: Kids at table in period costume, woman talking to kids, takes money from boy. / Bridgeman Images

AVE8895167: 1960s: Boy in period costume reading book. / Bridgeman Images

AVE8895180: 1960s: Two women using flat, wood tool pull bread out of stove oven. They have a conversation. / Bridgeman Images

AVE8895184: 1960s: Painting of people on college campus, colonial times. / Bridgeman Images

AVE8895191: 1960s: Monk and a man walk up to building, sit and have a conversation. / Bridgeman Images

AVE8895192: 1960s: Pioneer man opens door to cabin for woman and girls. Woman and girls exit cabin and look at cows. / Bridgeman Images

AVE8895199: 1960s: Woman operates spinning wheel inside room. / Bridgeman Images

AVE8895200: 1960s: Food on table with set places. Person sets down more food on table. Person pours cream in bowl of blueberries. / Bridgeman Images

AVE8895202: 1960s: Title page of book "Common Sense." Person places hand over page them removes it. / Bridgeman Images

AVE8895218: 1960s: Man sits on chair near desk and removes book from shelf. Man opens book and reads. / Bridgeman Images

AVE8895226: 1960s: Person writes in ink on dated page. / Bridgeman Images

AVE8895230: 1960s: Person squeezes groups of string between two pieces of wood. / Bridgeman Images

AVE8895232: 1960s: Men in top hats and capes walk along brook and talk. / Bridgeman Images

AVE8895239: 1960s: Children sit in pews as man holding book open walks back and forth between them while reading from the book. / Bridgeman Images

AVE8895241: 1960s: Two men, one holding a rifle, stand in forest talking to boy. / Bridgeman Images

AVE8895243: 1960s: Two men, one holding a rifle, stand in forest talking to boy. / Bridgeman Images

AVE8895244: 1960s: Oliver Cromwell sits at table in darkened room and writes with ink and quill pen. / Bridgeman Images

AVE8895250: 1960s: Photograph of men working in Victorian metal foundry sits on display. / Bridgeman Images

AVE8895257: 1960s: Oliver Cromwell sits at table in darkened room and writes with ink and quill pen. / Bridgeman Images