In theory (and in the International Phonetic Alphabet), edh is the th of "those" and "bathe". In practice, AIUI, it's usually interchangeable with thorn.What is the sound value for ð?
When the printing press came the printers (the people) were Dutch, hence were we get some spellings that don't make any sense like the "gh" in ghost (unrelated to the "gh" in words like light etc.) the Dutch added it because it makes sense in Dutch (at the time anyway I don't speak Modern Dutch so I don't know about now a days) and the Dutch never used "Þ" either they would have used the "th" because that is what was used in Dutch and German before those languages lost the soundPerhaps in the earliest days of Christianisation in England, but surely not later on -- not even up until the Norman Conquest, let alone to the invention of printing -- as well?
What is the sound value for ð?
ð is mainly a "Voiced dental fricative"
þ on the other hand is mainly a "Voiceless dental fricative"
but they're somewhat interchangeable