S.C. Const. art. III, § 20
In all elections by the General Assembly or either House thereof, the members shall vote “viva voce”, except by unanimous consent, and their votes thus given shall be entered upon the Journal of the House to which they respectively belong.
(1918 (30) 1123; 1919 (31) 40.)
For similar provisions in Constitution of 1868, see Const 1868, Art II, Section 24.