New crystallographic projections
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Abstract
Strictly speaking, as many projections can be constructed as there are geometric systems of the second degree — that is, an unlimited number — and if I now wish to mention such projections as new crystallographic ones, it is solely because they offer peculiar conveniences for solving certain crystallographic problems, conveniences not provided by other projections. Here I have in mind those projections which are obtained from the linear and gnomonic projections if they are subjected to transformation by inverse radii, which is why they can be called grammacyclic and gnomocyclic, respectively.
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