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