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Abacus
Child and abacus
Abacus
Face of Tide Predicting Machine No. 2
Air Transport concept
Mathematical equation
Typewriter keyboard
Tide Formula Component Cranks on Tide Predicting Machine No. 2
Tide Predicting Machine No. 2 ("Old Brass Brains")
Communications concept
Dials on Tide Predicting Machine No. 2
Summation Chain Close-Up
Gears on Tide Predicting Machine No. 2
Laptop
Abacus, brush and calculator
Abacus
Antique wooden abacus
Calculator
A Tide Formula Component Crank on Tide Predicting Machine No. 2
Abacus
Abacus and calculator
Tide Predicting Machine No. 2 ("Old Brass Brains")
Gears on Tide Predicting Machine No. 2
Two Sections of Tide Predicting Machine No. 2
Looking into the Top of Tide Predicting Machine No. 2
Mechanically Adding Trigonometric Functions
NOAA's Tide Predicting Machine No. 2
Abacus
Summation Chain
Abacus
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