'.t 



TO THE RIGHT HONOURABLE THOMAS GRENVILLE 



A MAN EQUALLY ESTEEMED FOR HIS PRIVATE VIRTUES 



AND RESPECTED FOR HIS DISTINGUISHED TALENTS 



WHO LATELY PRESIDED 



AS FIRST LORD OF THE ADMIRALTY 



OVER THAT DEPARTMENT OF THE PUBLIC SERVICE 



TO WHICH THE PRINCIPLES OF MECHANICAL SCIENCE 



MAY WITH THE GREATEST NATIONAL BENEFIT 



BE PRACTICALLY APPLIED 



THIS WORK IS DEDICATED 



BY THE AUTHOR. 



