Hand Was Free Stock Images

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Apple iPhone 5S in hand

Man hand holding iPhone 11 takes pictures photo camera phone

Man hand holding iPhone 11 takes pictures photo camera phone

Woman hand holding iPhone X with call number on screen

Woman hand holding iPhone X with call number on screen

Man hand holding iPhone X with social networking service Twitter

Man hand holding iPhone X with social networking service Twitter

Man hand with Apple Watch Series and finger touching screen

Man hand with Apple Watch Series and finger touching screen

Man hand holding iPhone X with home screen IOS

Man hand holding iPhone X with home screen IOS

Face of Tide Predicting Machine No. 2

The output face of Tide Predicting Machine No. 2, a special purpose mechanical analog computer for predicting the height and time of high and low tides. The pen at the top draws the tide height as the paper moves beneath it. The dials below display the predicted tide height and the corresponding date and time. When the machine was in operation, the operator recorded the height and time of high and low tides, which were later reproduced in printed tide tables. The U.S. government used Tide Predicting Machine No. 2 from 1910 to 1965 to predict tides for ports around the world. The machine, also known as “Old Brass Brains,” uses an intricate arrangement of gears, pulleys, chains, slides, and other mechanical components to perform the computations. A person using the machine would require 2-3 days to compute a year’s tides at one location. A person performing the same calculations by hand would require hundreds of days to perform the work. The machine is 10.8 feet (3.3 m) long, 6.2 feet (1.9 m) high, and 2.0 feet (0.61 m) wide and weighs approximately 2,500 pounds (1134 kg). The operator powers the machine with a hand crank.

Man hand holding iPhone X with home screen IOS

Man hand holding iPhone X with home screen IOS

Woman hand holding iPhone 11 with app Pinterest in screen

Woman hand holding iPhone 11 with app Pinterest in screen

Man hand holding iPhone X with home screen Control Center

Man hand holding iPhone X with home screen Control Center

Man hand holding iPhone X with social network on screen

Man hand holding iPhone X with social network on screen

Man with Apple Pencil holding in the hand iPad Pro

Man with Apple Pencil holding in the hand iPad Pro

Woman hand Apple Watch holding iPhone 7 Jet Black Onyx

Woman hand Apple Watch holding iPhone 7 Jet Black Onyx

Woman hand holding iPhone 11 widgets home screen IOS 14

Woman hand holding iPhone 11 widgets home screen IOS 14

Athlete hand with Apple Watch and app Activity on screen

Athlete hand with Apple Watch and app Activity on screen

Man hand holding iPhone 11 takes pictures photo camera phone

Man hand holding iPhone 11 takes pictures photo camera phone

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