The reality of psychic phenomena : raps, levitations, etc. . with a mano-meter. Fig. 7 shows diagrammatically the main por-tions of the instrument. A is a U-tube of glass, connected to a straighttube of glass C by a small piece of thick rubbertube at B. The free end of C is turned up atright angles. Both ends of the apparatus X and Y are open to the atmosphere. A is half filledwith water, and when there is equal gaseouspressure at X and Y the water remains at thesame level in both limbs of the U-tube. If,however, there is greater gaseous pressure upon Y than X, the water rises in the left-hand
The reality of psychic phenomena : raps, levitations, etc. . with a mano-meter. Fig. 7 shows diagrammatically the main por-tions of the instrument. A is a U-tube of glass, connected to a straighttube of glass C by a small piece of thick rubbertube at B. The free end of C is turned up atright angles. Both ends of the apparatus X and Y are open to the atmosphere. A is half filledwith water, and when there is equal gaseouspressure at X and Y the water remains at thesame level in both limbs of the U-tube. If,however, there is greater gaseous pressure upon Y than X, the water rises in the left-hand limb ABOVE, UNDER, AND ROUND TABLE 89 of the U-tube and falls in the right-hand one,and the difference of heights is a measure of thedifference of pressure. The length of the tube Cwas 14|^ in. Fig. 7 shows the elements of theapparatus only. As a matter of fact, the mano-meter used was a fine instrument required formeasuring the pressure of the gases in steam-boiler flues. It has a cock which can be rotatedby finger and thumb, so that the gaseous pressure. Fig. 7. can be held at any instant, and thus the differencein heights of the columns of water examined atleisure. If we suppose that there is a uniform upwardpressure of 025 lb. per sq. in. under the table,and if we further suppose that this pressure isexerted by something of the nature of a gas, andthat this gas is contained within limits beneaththe table (although such suppositions appearunthinkable), then we might expect to see adifference of pressure indicated on the manometerof about 7 in. 90 REALITY OF PSYCHIC PHENOMENA During periods when the table was steadilylevitated, I inserted the end Y of the manometer,with this end always pointing vertically upright,(a) immediately under a leg of the table, {b) atvarious places near the under surface of the table,(c) at several points in space between the floorand the surface of the table. The placing thetube in these positions in nowise affected thelevitations. When I had held
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