Editing Conical measure (section)

==History==
During his [[experiment]]s, [[Abū al-Rayhān al-Bīrūnī]] (973–1048) invented the conical measure,<ref>Marshall Clagett (1961). ''The Science of Mechanics in the Middle Ages'', p. 64. [[University of Wisconsin Press]].</ref> in order to find the ratio between the [[weight]] of a substance in air and the weight of water displaced, and to accurately measure the specific weights of the gemstones and their corresponding [[metal]]s, which are very close to modern measurements.{{citation needed|date=September 2011}}