wichita.edu
…ad 30 gradus inclinato, globus duos tantum pedes conficiebat; cum ex vi praescriptae regulae debuisset conficere 2 1/2 pedes. Porro supra planum inclinatum 40 graduum, globus, qui ex vi regulae debebat currere tres pedes, duos pollices et dimidium, experientia exactissime facta, non dedit, nisi duos pedes et 9 pollices. Supra planum 45 graduum deberet…
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/Kircher/Mundus/mundusvol1_detail.php