Two Augur Shells, each 90mm in length, above.
Tracing of ventral view of one shell, below.
A rough model for a theoretical auger shell.
The cone is made. Spiral is drawn up the sides.
Snip up the red line. flatten out. This is the shape need for the top surface of seashell
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I am guessing at internal column of shell, must be thinner than outer surface.
Measure the heights at each level of the sutures:-
Oh dear, the blog won't allow more....to be continued......
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10/4/2015 more:-
actually, the inner walls should be more horizontal and join to fuse with the central column, to make a funnell like spiral downwards.... diagram to follow......
Padding needs to be just at the top so that the laye paddingr under pushes the inner wall towards the centre. I have been stuffing some models too much!...
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