Re: Vintage Diagram Drawing Techniques?
A close look at the diagram at interest suggests that the straight thick line is not tangential to the thinner, curved coil line where the two abut. Maybe it is somewhere in the range of 30 to 45 degrees away from the tangent. If so, then the effectively oblique section through the curved line at the point of the abutment would be wider than the cross-section of the line itself, perhaps approaching the width of the thick line sufficiently closely that the difference is rendered small enough that it is not easily seen.
Cheers,
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