De Scientia Perspectiva, treatise on optical science and phenomena by Roger Bacon (circa 1214-1292), philosopher and Franciscan friar. It is copied in cursive script (Anglicana) by two English hands, datable respectively to the second half of the 14th century (ff. 1r-8v, and 15th century (ff. 9r...
Richard of Wallingford, Tractatus Albionis. This treatise by Richard of Wallingford (c. 1292-1336), abbot of St Albans and astronomer, relates to an equatorium, an astronomical instrument for the calculation of planetary positions. It was probably composed around 1326, at much the same period ...
Richard of Wallingford, Tractatus rectanguli. Prologue 'Rectangulum in remedium tediosi & difficilis operis', rubric 'Capitulum primum de arte componendi tibiam primam', incipit: 'Ad componendum igitur rectangulum, separemus laminam', explicit (f. 57r) 'ponimus istic finem', followed (f. 57r...