K c 4 

Robel'tson, J., late librarian to the royal society, and formerly headmaster 
of the royal academy, at Portsmouth. The eIe m e n t s 

o f na v i g a t ion; containing the theory and practice. With thc 
necessary tables, and compendiums for finding the latitude and 
longitude at sea. To which is added a treatise of mal' i ne f 0 l' t if 
i c at ion. Composed for the use of the royal mathematical school 
at Christ's hospital, the royal academy at Portsmouth, and the 
gentlemen of the navy. In two volumes. The fourth edition, with 
additions. Caresully revised and corrected by ,Villiam Wales, 
master of the royal mathematical school, Christ's hospital, London. 
1. Band. (Mit 6 Tafeln.) 2. Band. (Mit 9 Tafeln). (2 Bde.) (Donation 
Liechtenstein.) 8. London 1780.