EXPERIMENT XX. An easie way to make the Pressure of the Air sensi∣ble to the Touch.
* 1.1THE Pressure of the Air will be made sen∣sible to the Touch, if a Tapering Tube of Brass, whose Cavity at one end is an Inch, and the other two Inches and an half wide, be fix'd to the Pump instead of a Receiver; for if when the larger Orifice is Cemented on the Pump, one presses the Palm of ones Hand upon the smaller Orifice, and the Pump be set on Work, it will be a difficult Matter to take off ones Hand, and not a little painful; but the Pressure of the Incumbent Atmosphere will have a much more sensible Effect, if the larger Orifice be upwards instead of the smaller.