Acknowledgments 



The writer wishes to acknowledge his great indebtedness to the 

 various compilations relating to clockmakers and instruments which 

 have been consulted in the preparation of this work, and which 

 have provided an invaluable basis for it. 



He is especially grateful for the generous and interested assistance 

 of the many who have cooperated in making this work possible. 

 Particular credit must be given to Mrs. H. Ropes Cabot of the 

 Bostonian Society; Mrs. Mary W. Phillips of the Department of 

 Science and Technology of the U.S. National Museum; Prof. 

 Derek J. de Solla Price, Avalon Professor of the History of Science 

 at Yale University; Mr. Stephen T. Riley, Director of the Massa- 

 chusetts Historical Society; and Mr. Charles E. Smart of Troy, 

 New York. 



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