It is possible that improved algorithms will in future facilitate the measurement of individual layers to an extent where it becomes practicable.
Three-phase alternating-current motor traction became practicable in the 1980s.
One possible interpretation of these provisions is that unlawful non-citizens should be kept in detention for as long as necessary to remove them, and that if removing them never became practicable, that they would be detained until death.
Telemedicine became practicable at the end of the 1980s with the availability of low-cost computing and digital telecommunication (e.g. ISDN).
While defining the school-leaving age as 15, the act granted the government the power to raise the age to 16 "as soon as the Minister is satisfied that it has become practicable", which happened in 1973.
It holds promise for BU since its first evaluation in the 1970s and has become practicable with cheap and easily applicable PCM [ 12].
I assume that Cameron and Rees would like to have their problem defined and perhaps solved rather quicker that the century it took for the astronomical and timekeeping longitude solutions to become "practicable and useful at sea" – the demand of the 1714 Act.
