Instrument is the semantic role of an inanimate thing that an agent uses to implement an event. It is the stimulus or immediate physical cause of an event.
Instrument words are usually nouns occurring in the noun phrase of a clause:
In some languages, the noun occurs in a second clause or serial verb construction:
(English)
Longacre, Robert E. 1983.The grammar of discourse. New York: Plenum.
Larson, Mildred L. 1984.Meaning-based translation: A guide to cross-language equivalence. Lanham, MD: University Press of America.