Considerations on the unhappy accidents that attended the last undertaker in his works at Dagenham Breach : With remarks on the excuses made use of to screen the deficiency of the workmanship, in a treatise, entitled, An account of the stopping Dagenham Breach, &c. and also, ... the proposal for rendering the port of Dublin more commodious, ... To which is subjoin'd, An essay on the perpetual motion. By a gentleman who was concern'd.