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a sentence out of Encyclopea Britannica, talking about a wood cutting tool:

"Saw developed with smelted copper, from which a blade could be cast. "

how do you understand the word 'developed'?

does it mean that the technology of making saws developed along side with that of the technology of copper smelting?

or it only says that a saw was made of smelted copper?

in any case, the word 'develop' gives me the most of trouble.

with all respect, i thought EB is supposed to be easy to understand.
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Could you give us the complete sentence?
Comments  
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The true saw, a blade with teeth, one of the first great innovations of the Metal Age, was a completely new tool, able to cut through wood instead of merely gashing the surface. It developed with smelted copper, from which a blade could be cast. Many of the early copper saws have the general appearance of large meat-carving knives, with bone or wooden handles riveted to a tang at one end.
I think your first idea is right: the design of the saw developed along with the technology of smelting Cu.
thanks.
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