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If you tire of flicking through piles of textbooks looking for the formulas
for converting noggins into litres or foot-pound-force per hour into megawatts,
do not despair. Chuck out the lot and buy Scientific Unit Conversion by
François Cardarelli (Springer-Verlag, £19.50, ISBN 3 540 76022 9),
which claims to contain every scientific unit ever used—and a reply card
for you to let the author know if he’s missed one out. All weights, volumes,
powers, areas, field strengths—you name it, it’s here. Related units are
tabulated together for easy interconversion and, most importantly, into SI
units. A gem for engineers, scientists, historians, journalists . . .