1. The best guide to the Tabulae primi mobilis, although they are nowhere mentioned, is the edition of Johann Werner's De meteoroscopiis libri sex by Björnbo A. and, following his death, J. Würschmidt in Abhandlungen zur Geschichte der mathematischen Wissenschaften, xxiv/2 (1913). The reason is that Werner, using his instrument, the meteoroscope, which he also calls a saphea, a universal astrolabe containing stereographic projection of circles of longitude and latitude, provides solutions for all of the problems in the Tabulae primi mobilis, and a good many more besides. It is a very interesting work, very well edited, and should be better known. A description and illustration of such an instrument may be found in North John, Horoscopes and history (Warburg Institute Surveys and Texts 13
2. London, 1986), 67-69. Obviously, the precision of using the Tabulae primi mobilis far exceeds that of any instrument that could be made.