If the question hereinbefore provided shall have been submitted to the qualified electors of the county, and the majority of the electors voting thereon shall have voted favorably thereon, and if the county election board has made a gradual installation of voting machines approved by the Secretary of the Commonwealth, then such county board of elections may, upon their own motion, authorize the temporary installation of voting machines approved by the Secretary of the Commonwealth for primaries and elections in one or more election districts of the county and the use of such voting machines shall be as valid for all purposes as if the voting machines had been permanently installed.
25 P.S.§ 3004.1