2 off, 1 metre diameter relief globes of the earth, showing: (1) Present day ice cover, ( 2) Ice cover during last ice age relief globes of the earth
Standard humidity units, 3, used to calibrate and adjust instruments, prepared by Humitec Ltd, West Sussex, 1994 Standard Humidity Units
Reconstruction absorbtion hygrometer based on Leonardo da Vinci drawings Reconstruction absorbtion hygrometer