ABSTRACT
Mile 7.4074 km Rhineland rod 3.767 m Rhineland foot 31.4 cm Inch 2.61 cm A nail of our hand 1.5-2 cm A coarse grain of sand 870 µ A common sand 400 µ A fine grain of sand 100-260 µ Hair of a pig 172-294 µ Hair of a horse 125 µ A hair from my beard 100 µ A hair from our head 60-80 µ A hair from my wig 43 µ A hair of a sheep 25-30 µ The hair of a louse 3-9 µ The hair of a cheese-mite 1-3 µ The eye of a water-flea 200 µ The eye of a louse 50-60 µ A thread from the cocoon of a silkworm 8 by 16 µ A red globule of the blood
(erythrocyt) 7.2 µ Ø The smallest animals in
pepperwater (bacteria) 2-3 µ
Measures of surface.
