Sentence:  The 10.3 - cm observation of Sloanaker was made on May 20 , 1958 , <WSD>using</WSD> the 84 - foot reflector at the Maryland Point Observatory of the U.S. Naval Research Laboratory . 
Meaning of the word marked with <WSD> tags:  put into service; make work or employ for a particular purpose or for its inherent or natural purpose