3 hygrometers, 1 barometer and 1 dial.

1. Aneroid barometer. S.l., H. Mettler/Godschmid, s.d. Brass, glass, 4,6 x 5 cm. In case. - 2. Barometer dial. London, Negretti & Zambra, s.d. Ivory, mica, diam. 5,5 cm. Numbered 6276/15a. Cardboard box. - 3. Hair tension hygrometer. Paris, Deleuil, 19th c. Brass. Saussure hair hygrometer, invented ca. 1780 (hair missing). - 4. Polymètre Lambrecht. Germany, ca. 1900. Mercury thermometer and hair hygrometer (diam.: 8 cm). Brass, 24 cm. With user manual. - 5. Sling psychrometer. London, Casella, 19th c. Wood, glass, bakelite, 21,5 x 6 cm. Leather case.
Joined: 1. Sundial "Le chronomètre solaire universel". Leuven, E. Notebaert, 20th c. Cardboard, 13,5 x 10,8 cm. Cardboard box. - 2. Comparative time indicator Holland-Oost Azie lijn. Cardboard, 13,8 x 18 cm. (7 pcs)