Firstly, I resurrected Rafael Arroyo’s beloved laboratory still, the birectifier, and it is incredible:
I have a large index elsewhere of birectifier case studies and background.
You can find Arroyo papers here:
This, I think, is Arroyo’s first report:
10/28/18 Arroyo’s First Report (1938)
These two papers I translated from Spanish with Circular 106 being of startling importance.
I wrote quite a few background texts about Arroyo’s work as well as explorations of a few key organoleptic tests he used for rum evaluation:
12/20/15 The Prior Patents of Rafael Arroyo
2/14/16 Rum, Osmotolerance and the Lash
2/17/16 Aroma Breakage and Rum Design
5/1/17 Arroyo’s Oidium
1/17/18 The Grand Arôme Rum Tease
1/21/18 The Surface Tension of Rum
3/8/18 Wüstenfeld’s Exhaustive Test
3/31/18 The Evaporation Test