4 CONTENTS. 



LIST OF ILLUSTRATIONS. 



Facing page. 

 Plate 1. Britisli Association tide-predicting machine, or British tide predictor 



No. 1 6 



Plate 2. Roberts tide-predicting machine, or British tide predictor No. 2 8 



Plate 3. British tide predictor No. 3 — now French tide predictor 10 



Plate 4. Roberts universal tide predictor 12 



Plate 5. Ferrel tide-predicting machine, or United States Coast and Geodetic 



Survey tide-predicting macliine No. 1 14 



Plate 6. United States Coast and Geodetic Survey tide-predicting machine 



No. 2 16 



Plate 7. United States Coast and Geodetic Survey tide-predicting machine 



No. 2, dial end 18 



Plate 8. Main driving gear and automatic stopping device 20 



Plate 9, Dial case, side view 22 



Plate 10. Vertical driving shaft, front component frame 24 



Plate 11. Forward vertical driving shaft, rear component frame 26 



Plate 12. Rear vertical driving shaft, rear component frame 28 



Plate 13. Fig. a, Releasing gears on vertical driving shafts; Fig. b, Component 



cranks 30 



Plate 14. Dial case and front component frame, time side 32 



Plate 15. Facsimile curves 36 



