Society 'Mathesis Scientiarum Genetrix'; medal awarded to mathematician and structural engineer Jan Timmerman for his treatise 'Tot Nut voor Rhijnland'. Front: illuminated by sky light; Minerva with helmet and lance stands by column; she hands open book to child; around her globe; instruments; rolls of paper and a bust and five children within a wrap. Reverse: inscription; specific aspects; allegorical aspects of Minerva; Minerva as patroness; Jan Timmerman; anonymous; Netherlands; 1796; silver (metal); engraving; d 4.8 cm x w 37.2 gr