Portrait of Hendrick de Hartog; examiner mates for the VOC and the Council of Asian possessions; professor of mathematics and nautical science at Atheneum Illustre in Amsterdam and member from Felix Meritis. Sitting; halfway at a table; a paper with a geometric drawing in the left hand. On the table are a sextant and a telescope; historical persons; quadrant; sextant; octant (nautical instruments); Dutch East India Company; Hendrick de Hartogh; Felix Meritis; Adriaan de Lelie; 1790; canvas; oil paint (paint); h 79 cm x w 64 cm