. A new universal history of arts and sciences, shewing their origin, progress, theory, use and practice, and exhibiting the invention, structure, improvement, and uses of the most considerable instruments, engines and machines, with their nature, power, and operation, decyphered in fifty two copper-plates . e properly illulhatedby a few problems in the dodtrine o\ projeililes : for,as an author of great repute in this fubjecl ob-ferves, it is only the great importance of Gunnery,that makes it a diftindt do£lrine from proje/jiles ingeneral ; it being no more than an application ofthofe laws, w
. A new universal history of arts and sciences, shewing their origin, progress, theory, use and practice, and exhibiting the invention, structure, improvement, and uses of the most considerable instruments, engines and machines, with their nature, power, and operation, decyphered in fifty two copper-plates . e properly illulhatedby a few problems in the dodtrine o\ projeililes : for,as an author of great repute in this fubjecl ob-ferves, it is only the great importance of Gunnery,that makes it a diftindt do£lrine from proje/jiles ingeneral ; it being no more than an application ofthofe laws, which all bodies obferve, when call:into the air, to fuch as are put in motion by theexplofion of guns or other engines of that fort. Andit is the fame thing whether it is treated in themanner oi projeflilcs in general, or of fuch only asbelong to gunnery ; for, from the moment the forceis impreffcd, all diftinftion with regard to the power,which put the body firfl: in motion, is loft, and itcan only be confidered as a fimple proje£lile. Prch. I. The impetus of a bali, and the hori-zontal diftance of an objefl: aimed at, with its per-pendicular height or deprellion, if thrown on af-cents or defcents, being given, to determine thediredlion of that ball. From the point of projedlion A draw A m
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