was established. In 1850 a single currency was imposed to replace the cantonal currencies, while all customs between cantons were abolished. In 1851 the telegraph was organized, while all weights and measures were unified. In 1868 the metric system was allowed and in 1875 declared obligatory and universal. In 1854 roads and canals taken in hand were taken under federal control. The Federal Polytechnic wasn't opened until 1855 in Zurich, though the Federal university authorized by the new constitution has not yet been set up. In 1859, Reisläuferei (mercenary service) was outlawed, with the exception of the Vatican guard. In 1866 the rights granted only to Christians (free movement and freedom of religion) under the 1848 Constitution were extended to all Swiss regardless of religion. 1874 Revised Constitution From 1848 onwards the cantons continually revised their constitutions, with most including the introduction of the referendum, by which laws made by the cantonal legislature may (facultative referendum) or must (obligatory referendum) be submitted to the people for their approval. It was therefore only natural that attempts should be made to revise the federal constitution of 1848 in a democratic and centralizing sense, for it had been provided that the Federal Assembly, on its own initiative or on the written request of 50,000 Swiss electors, could submit the question of revision to a popular vote. The first attempt at a revision in 1872 was defeated by a small majority, owing to the efforts of the anti-centralizing party. Finally, however, another draft was preferred, and on the 19 April 1874, the new constitution was accepted by the people – 14 cantons against 7 (those of 1848 without Ticino, but with Fribourg and Lucerne). The Constitution of 1874 further strengthened the federal power. The revised Constitution included three major points. First, a system of free elementary education was set up, under the superintendence of the Confederation, but managed by the cantons. Second, a man settling in another canton was, after three months (instead of two years in the 1848 Constitution), given all cantonal and communal rights (formerly only cantonal rights were granted). Finally, the referendum was introduced in its "facultative" form; i.e., all federal laws must be submitted to popular vote on the demand of 30,000 Swiss citizens or of eight cantons. The Initiative (i.e., the right of compelling the legislature to consider a certain subject or bill) was not introduced into the Federal