1858, issued 31 May 1859. Singh, Sarbjit, Experiments in Fluid Mechanics, PHI Learning, 2012 . Stein, Benjamin, Building Technology: Mechanical and Electrical Systems, John Wiley & Sons, 1996 . Suski, J.; Puers, R.; Ehrlich, C.D.; Schmidt, J.W.; Abramson, E.H.; Sutton, C.M., "Pressure", ch. 3 in, Goodwin, A.R.H.; Marsh, K.N.; Wakeham, W.A. (eds), Experimental Thermodynamics (vol. 6): Measurement of the Thermodynamic Properties of Single Phases, Elsevier, 2003 . Zimmerli, Adolph, "An improved mercury U-gage", Industrial & Engineering Chemistry: Analytical Edition, vol. 10, iss. 5, pp. 283–284, 1 May 1938. Pressure gauges