Level Collection

Tower Bridge
circa 1894: Upper level of Tower Bridge London with bascules up. The Tower of London can be seen in the background. (Photo by London Stereoscopic Company/Getty Images)

Social Pyramid
circa 1890: A cartoon showing groups of people bearing others on their shoulders ending with one man at the top. the words accompanying the layers are

Cross section illustration of pit mine showing elevators moving up and down in mine shaft, and train of coal below

Carpenters level

Illustration of rain gauge measuring rainfall levels

Illustration of car fuel gauge with float switch in glass tank

Digital Illustration of spaced quarry tiles embedded in cement-based adhesive, and wood block, mallet, and spirit level

Digital illustration of using spirit level and straightedge to ensure fence posts are parallel to one another on sloping site

Illustration of sea levels

Parking Spiral
circa 1933: Spiral ramp allowing easy access for cars to all levels of a car park, the Garage Littorio, Piazza Roma, Venice (Photo by General Photographic Agency/Getty Images)

Exchange Building
circa 1930: The interior of the London Coal Exchange with tiers of balconies and a domed glass roof. (Photo by General Photographic Agency/Getty Images)

Beerenberg Mountain, the northernmost active volcano above sea level of the Earth on the island of Jan Mayen, Greenland, Norway, Europe

Glacier cave at Vatnajoekull, Iceland, Scandinavia, Europe

High tides 1962 and 1976, water level markings, Teufelsbrueck, Hamburg, Germany, Europe

Railroad crossing

Flood level sign, Duernstein, Wachau valley, Waldviertel region, Lower Austria, Austria, Europe

Purple foxglove, Ladys glove (Digitalis purpurea), group of blossoms on a forest clearing area in a Scots pine forest (Pinus sylvestris), near Nicklheiml, Bavaria, Germany, Europe

Eiffel Elevator
The elevator at the first level of the Eiffel Tower, during its construction. The elevator is still used for conveying sightseers. (Photo by Three Lions/Getty Images)

Seine Rising
circa 1960: Parisians watch the level of the River Seine rise to cover the knees of the statue of the Zouave at Alma Bridge during a period of heavy rain in Paris. (Photo by Keystone/Getty Images)

The Dorilton Apartments
A view from street level of the elaborate ham and cheese western facade on Broadway of the Dorilton Building (1902, Janes & Leo) as it undergoes cleaning, Upper West Side, New York, late 1920s

Batwing Coat
20th February 1922: An ankle length coat in two shades of gray with batwing sleeves and scallop trimming at waist level worn with a wide brimmed hat. Designed by Caro

Hungry Seal
circa 1950: A young sea lion at Antwerp Zoo opens his mouth for some fish; they can go without food for a long time because of their layers of fatty tissue but when they do eat it may be as much as

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