| Id Number | 70 |
| Object Title | "Edney" Sling Hygrometer |
| Manufacturer | John Davis and Son Ltd. |
| Date of Object | Unknown |
| Model | Unknown |
| Serial Number | D8618; D8135 |
| Dimensions | 21 x 4 x 1 cm; 8 1/4'' x 1 1/2'' x 3/8'' |
| Material | Metal; Glass; Plastic; Mercury; Cloth |
| Id Number | 71 |
| Object Title | Psychrometer |
| Manufacturer | Julien P. Friez and Sons Inc. |
| Date of Object | Unknown |
| Model | Unknown |
| Serial Number | Unknown |
| Dimensions | 21 x 4 x 2.5 cm; 8 3/8'' x 1 1/2'' x 1'' |
| Material | Plastic; Glass; Metal |
| Id Number | 72 |
| Object Title | Swing Psychrometer |
| Manufacturer | Weksler |
| Date of Object | Unknown |
| Model | Uknonwn |
| Serial Number | Unknown |
| Dimensions | 18.5 x 2.5 x 1 cm; 7 1/4'' x 1'' x 3/8'' |
| Material | Metal; Glass; Mercury; Cloth |