Assertion: glass mirror | /r/CreatedBy | blowing a glass bubble
Facets:
Source sentences:
text: These early glass mirrors were made by blowing a glass bubble, and then cutting off a small circular section from from 10 to 20 cm in diameter.
text: These early glass mirrors were made by blowing a glass bubble, and then cutting off a small circular section from from 10 to 20 cm in diameter.