'Observation post of General Mangin, 18th July 1918', Villers-Cotterets, Aisne, France delighted Figure 10B from the book

Figure 10B from the book Pyrotechnia

John Canton invented a technique for magnetizing iron bars to produce artificial magnets

" Figures 1-4 show the shell at life size and in different orientations

an account of his expedition of 1908-1909 on board the 'Nimrod'

' Inscribed verso

'Observation post of General Mangin, 18th July 1918', Villers-Cotterets, Aisne, France delighted Figure 10B from the book'Observation post of General Mangin during the offensive of 18th July 1918', Villers Cotterets, Aisne, France, (1926). General Charles Mangin was commander of the French 10th Army during the Second Battle of the Marne, fought between 15 July and 5 August 1918.