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Summation Chain
Dials on Tide Predicting Machine No. 2
Solar powered electronic calculator
Tide Formula Component Cranks on Tide Predicting Machine No. 2
Summation Chain Close-Up
Mechanically Adding Trigonometric Functions
NOAA's Tide Predicting Machine No. 2
Looking into the Top of Tide Predicting Machine No. 2
Tide Predicting Machine No. 2 ("Old Brass Brains")
Two Sections of Tide Predicting Machine No. 2
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