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that in several instances a greater height of the first gage produced a less height of the second: this arose from the nearer approach of the apex of the cone to the orifice of the tube, the stream losing a greater portion of its velocity by this divergence than it gained by the increase of pressure. At first sight, the form of the current bears some resemblance to the vena contracta of a jet of water: but Venturi has observed, that in water an increase of pressure increases, instead of diminishing, the distance of the contracted section from the orifice. Is it not possible, that the facility with which some spiders are said to project their fine threads to a great distance, may depend upon the small degree of velocity with which they are thrown out, so that, like a minute current, meeting with little interruption from the neighbouring air, they easily continue their course for a considerable time?
| Table v. | |||||
| A | 1. | 2. | 3. | 3.8 | |
| B | C | C | C | C | |
| 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 15. 18. 20. |
.1 .12 .17 .2 .25 .30 .35 .37 .39 .40 .50 |
.1 .12 .25 .4 .5 .52 .54 .56 .58 .6 .7 |
.1 .2 .3 .4 .5 .6 |
.5 |
The diameter of the tube .07. A is the distance of the liquid from the orifice. B, the pressure. C, the diameter of the surface of the liquid displaced. |
