Rowing machines were first used in Archaic Greece. Chabrias, an Athenian military general in 4th Century B.C., invented wooden rowing simulators for his inexperienced oarsmen. This enabled them to learn technique and timing before stepping foot on actual water crafts. And it must have worked — Chabrias successfully led numerous naval attacks against the Spartans.
At its founding, it had nine clubs; today, there are 12: Fairmount Rowing Association, Crescent Boat Club, Bachelors Barge Club, University Barge Club, Malta Boat Club, Vesper Boat Club, College Boat Club, Penn Athletic Club Rowing Association (Penn AC), Philadelphia Girls' Rowing Club (PGRC), Gillin Boat Club and St. Joseph's University and St. Joseph's Prep. At least 23 other clubs have belonged to the Navy at various times. Many of the clubs have a rich history, and have produced a large number of Olympians and world-class competitors.
The rowing machine itself is unlike any other on the market with its patented water filled flywheel. It is hard to exactly copy the action of a scull on the water, but the mechanics of the flywheel spinning in water comes in a close second on dry land. The fact that the water is 800 times denser than air means that there is no need for any extra resistance or dampening that you will find in normal air rowers. The faster you pull, the more resistance is generated giving it infinite variability. However, if you want to be able to practice rowing with a faster stroke, you will have to reduce the amount of water in the tank unlike an air rower where you just have to adjust the baffle.