Harmonic …

Harmonic … (Fr., Ger.: Harmonie …), as a prefix to names of organ stops, harmonic indicates that the pipes are constructed so as to overblow the second harmonic, i.e., the oct. if the pipes are open ones, the 12th if they are stopped. This is accomplished by drilling a hole halfway up the body of an open pipe, or ⅔ to 3/5 up the body of a stopped pipe. Sorge described the same principle in 1773, with overblow hole at 3/7 of the pipe length; it was forgotten and reinvented by Aristide…