Viewing page 100 of 140

This transcription has been completed. Contact us with corrections.

96.

The air condensing itselfe according to ye weights it is charged with, if we make an engine AB composed of a coffer  EFGH full of water to ye line JL a little below EF, and a pipe MN, wch must be well soddered in M and in O

[[image:  drawing of two vessels, top vessel E F H G, lower vessel C D T K.  There are three tubes inserted in the vessels as follows: left tube Y X from the air space in the top vessel down to the air space in the lower vessel; middle tube A V projecting from the top of the top vessel to near the bottom of the vessel, below the liquid level; right tube M N from above the top vessel down thrugh the bottom of the top vessel and down into the bottom vessel to near the bottom of the bottom vessel.  There are three liquid levels indicated by dotted lines: I L near the top of the top vessel; R S near the top of the bottom vessel; and Q P near the bottom f the bottom vessel.  A spout of liquid spurts up through A to point Z.]]

with ye two plates E F G H wch make ye upper and lower side of ye coffer to ye end ye air may not enter ye coffer E G will serve for a reservatory.  There must also be another coffer equal to ye first as C D T K full of air to wch ye pipe M N must be well soddered.  When water is poured thrô M it will descend through N to K T and being mounted to P Q, ye air contained in ye space Q P C D and in ye pipe X Y well soddered to ye two coffers not being able to go out through A will be condensed by little and little till there is made an equilibrium between ye weight of ye water in M N, and ye spring of ye inclosed air.  For example if ye water is elevated to R S, ye air contained in ye space C D S R in ye pipe X Y and in ye space E I F L, shall be condensed by ye weight of ye water M S, and will press ye water I H T L;  then if we open ye passage A whose pipe descends to V nigh  to H G, ye water will spout ye height A Z equall almost to ye height M S;  because that ye air pressed by ye height of ye water M S, makes almost ye same effort upon ye water I G as if ye pipe M S full or water was above ye water I L and ye water which falls from ye spout [[strikethrough]] will last [[/strikethrough]] passing thrô M, will reenter into ye inferior coffer, and by that means ye spout will last till all ye water [[strikethrough]] ?? [[/strikethrough]]; from ye extremity V of ye pipe A V to ye extremity Y of ye pipe XY is spouted out.  This engine carrys ye name of Heron;  he described it in his Treatise de Spiritualibus, according to ye of Commandin.

Transcription Notes:
mandc: Reviewed and amended image description. Changed all J's to I's. It appears that there was no J in this scribe's medievil alphabet. I found no reference to the "B" below the lower vessel, and did not appear in the Desaguliers translation. The Desaguliers translation uses different letter designations and imcludes a collection pan or reservoir on top of the top vessel to collect and direct the water spouting from the spout A. "Heron" refers to "Fons Heronis" or "Hero's Fountain," "Commandin" to "Commandinus." Image: http://echo.mpiwg-berlin.mpg.de/ECHOdocuView?url=%2Fpermanent%2Flibrary%2FQERNH1MN%2Fpageimg&mode=imagepath&pn=254&ww=0.1844&wh=0.2626&wx=0.7641&wy=0.6555