By Monks N., Palmer P.
Read Online or Download Ammonites. London: The Natiral History Museum. 159 p PDF
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Extra info for Ammonites. London: The Natiral History Museum. 159 p
The water then moves from the less concentrated sea water into the more concentrated blood. Because the siphuncle is only semi-permeable, salt cannot escape from the blood into the sea water. The saltiness of the blood in the siphuncle does not decrease, and so water keeps moving from the chamber into the siphuncle. The net effect of this is to reduce the amount of water in the chamber. This reduces the pressure in the chamber as the water level drops, which causes gas to diffuse out from the blood and into the chamber.
One possible solution to this contradiction is that ammonites did not go into particularly deep water, but by having shell designs that were intrinsically more robust they could make them thinner and lighter than those of nautiluses. In this way they would have been able to produce shells more quickly using less material, and consequently grown much faster. An alternative explanation of the function of the complex septum implies they were an adaptation not to water pressure but to predation. The suture line is seen as a mechanism for distributing what are called 'point forces' around the shell.
This could only mean one thing: it had a greater volume than the lump of gold, so could not be pure gold. The goldsmith had replaced some of the gold with another metal, and so attempted to defraud the lung. The fate of the goldsmith is unknown, but doubtless it was unpleasant. Archimedes' Principle operates on the relationship between the volume of an object and the volume of water it displaces. But it leads to a further development, the Principle of Buoyancy - why some objects sink and some float.