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Mechanically Adding Trigonometric Functions
Summation Chain Close-Up
Tide Predicting Machine No. 2 ("Old Brass Brains")
Gears on Tide Predicting Machine No. 2
A Tide Formula Component Crank on Tide Predicting Machine No. 2
Tide Formula Component Cranks on Tide Predicting Machine No. 2
A Nautical T shaped flag pole with the US flag on top and government offices flags lined up underneath
Gears on Tide Predicting Machine No. 2
Tide Predicting Machine No. 2 ("Old Brass Brains")
Summation Chain
Looking into the Top of Tide Predicting Machine No. 2
Two Sections of Tide Predicting Machine No. 2
Face of Tide Predicting Machine No. 2
NOAA's Tide Predicting Machine No. 2
The Harper Cabin
Dials on Tide Predicting Machine No. 2
The Sky Traffic
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