The importance of infrastructural work for the mobility of practices a
nd for the capacity of centres to act on distant sites is stressed in
both science studies and the sociology of state formation. Employing K
ula's typology of metrological systems, this paper examines four areas
of metrological reform in pre-Confederation Canada, stressing the exi
stence of metrological hybrids. Metrological standardization is held t
o depend upon the exercise of sovereign state power at the same time a
s it extends the administrative capacity of state agencies.