Description
' T William Elford Leach (1790-1836) British naturalist was elected a Fellow of the Royal Society in 1816
View of Holland House
Matthew Wood
'Wittington's Ghost'
A terrella expensive ' T William Elford LeachA terrella ('little earth') is a sphere made of a magnetized substance, used to simulate the magnetic field of the earth. In the 16th century the English physician William Gilbert used a terrella made out of lodestone (a naturally occurring magnetized mineral) to demonstrate that the earth is magnetic, and to explain how mariner's compasses work. 17th century
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