Perhaps you should try some spelling variations:
"royal meteorological instruments" » "royal meteorological measurements", "local meteorological instruments", "road meteorological instruments", "global meteorological instruments"
"real meteorological institute" » "real meteorological input", "ray meteorological institute", "road meteorological institute", "local meteorological institute"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("royal meteorological instruments") OR ("real meteorological institute")).
• Removing quotes may allow a broader search: (( royal meteorological instruments ) or ( real meteorological institute )).
• Adding a wildcard symbol may retrieve word variants: (("royal meteorological instruments") or ("real meteorological institute"))*.