sentences:  On their return the Buschmanns set up a workshop in Berlin, Eduard did stay in Berlin and Friedrich was on a tour through Germany up to 1829 or even a bit longer.He was already skilled and experienced enough at musical instrument construction to begin building terpodions and aeolins as the letters written by him and his Father make clear.The first evidence of the word Aeoline we find in a letter dated 28 December 1828.