Table of Contents 



Page 



Drift-bottle designs 2 



History 2 



Drift bottles released in Saginaw Bay and Lake Huron . . 4 



Releases and recoveries 7 



Wind data 10 



Water movements of Saginaw Bay 11 



General features of the bay 11 



Previous studies 12 



Drift-bottle movements in 1956 12 



Water movements of Lake Huron 16 



Previous studies 16 



Drift-bottle movements in 1956 17 



Dynamic heights 18 



Appraisal of the general pattern 19 



Rate of drift 21 



Quantitative relationship between surface drift and wind ... 24 



Factors influencing drift-bottle movements 25 



Saginaw Bay 25 



Lake Huron 2 6 



Recommendations for study of currents on the Great Lakes ... 26 



Acknowledgments 27 



Summary 27 



Literature cited 27 



Appendix 30 



