Hot answers tagged alternative-tunings
The simple, short answer is that practically all families of instruments started out with just intonation and continued that way well into the 19th century (the 1800s). The exception is keyboard instruments, and fretted instruments tuned in fourths, such as the guitar, and before it the lute and the viola da gamba. Keyboard and guitar-family instruments ...
If you want to know about fret placement on guitar-family instruments, please see the answers I gave to this question in which I provided information about modern guitars which can play in just intonation or various types of meantone temperament.
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