South African Class 12A 4-8-2 be very successful engines which performed well, with low repair costs. Modifications in design of details after entering service were negligible. None of the SAR Class 12A or Class 12AR locomotives were sold into industrial service, but between 1947 and 1953 eight Class 12A locomotives, similar to the unreboilered SAR locomotives but without superheaters, were built new for industrial service by NBL. The builders, years built, works numbers, reboilering particulars and original tender types are listed in the table. South African Class 12A 4-8-2 The South African Railways Class 12A 4-8-2 of 1919 was a steam locomotive. Between 1919 and
Minim (unit) size of a drop can vary considerably depending upon the viscosity and specific gravity of the liquid. (At the time, the phenomenon of surface tension was not well understood.) The minim, on the other hand, was measured with a graduated glass tube known as a "minimometer", later known as the minim-tube. The minim-tube was a type of graduated pipette, a device invented in 1791 by François-Antoine-Henri Descroizilles. Apothecaries' measures are fully defined in the United Kingdom's Weights and Measures Act of 1878, but the UK's 1963 Weights and Measures Act provided for the abolition of the minim, fluid scruple, and