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