No. 55 451. 



Actinometers. Hypsometers. Hygrometers. 



653 



55 449. 1 : 4. 



55 451. 1 : 3. 



55 453. 1 : 



55.448. Capillary Hygrometer after Saussure. Figure (M. P., Ill, Fig 481 [II, 2, Fig. 357]; s. d. 

 Gan.-Man., Fig. 520; Gan.-Eein., Fig. 389), with thermometer 1. 5. 



55.449. Capillary Hygrometer after Koppe, Figure, with adjusting device and with 

 thermometer 1. 16. 



55 450. Hygrometer after Mithof, scale diam. 80 mm, in black polished wood mount ... 0. 4. 



55.451. --idem, on base, Figure 0. 8. 



55.452. - - idem, with rain shade and arm for fixing to window 1.5.0 



55.453. Polymeter after Lambrecbt, Figure, in brass case (M. T., p. 161 and 162) . . 1. 0. 



55.454. -- idem, in phosphor-bronze case (non-oxidisable) . . . . 1. 5. 



Cl. 1983, 1984, 



1985, 1980. 1988. 



