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Ludwik and Mark had a question about a crucial experiment of the
'bird in a box' variety that Jim described. (Quoted below)
The purpose of Jim's description was to demonstrate that the
weight of a box plus flying animal is unchanging, momentary
excursions excepted.
The problem with Ludwik's query, is that it asks if the box
+ animal weight remains constant plus or minus the animal's weight.
The answer to which is "Yes of course, whether it decides in favor
or against either of the following positions":
"the flying animal's weight reacts on the floor" OR
"The flying animal's weight is NOT reacted on the floor".
Hence, I deduce that Ludwik's question went unanswered because
an answer to his question would not contribute anything meaningful
to the discussion.
I am quite certain that this is not the response Ludwik meant
to invoke. But I cannot read his mind, only his words.
Listmembers;
My nature always says go to the lab when I hear "opinions" (I know that
places me several rungs down THE ladder)
My high school students several years ago made a box from dry-cleaner's
plastic wrap and balsa - total was less than 20 grams about 50 cm by 50
cm. A closed system sealed with tape, after fly was inserted - positive
pressure. We waited until spring to capture one of those large flies
(commonly called - casement flies) that emerge in rooms. They placed the
fly in the "box" and placed it on a top-loading balance: 0.1 mg.
no question about what happens (flying,landing, starting off from bottom
or side or top (or repeating after punching holes in plastic for air to
move in or out as in an open system)).