Old European craftsmen would smile in recognition of these tricks, but they are seldom applied to guitars. Many of us suffer periods of lutherie burn-out, but few as dramatically as Somogyi, whose house and shop were lost in a great California fire. This interview offers early background information and an update of how he has coped since the fire. With a large number of drawings. The chief difference between the Hardanger and a normal violin is its use of sympathetic strings, though other differences abound.
Ornate decoration is also usual.
Golber offers a good description of a typical Hardanger and how to set it up. With nine photos and a number of drawings. With 26 photos and detailed captions. He has studied the subject deeply. With 12 photos and a scale drawing of an 1816 Salon Guitar by Jose Martinez.