| Description | Harrison asks that they prepare electros of two blocks and send them to the assistant secretary of the Manchester Literary and Philosophical Society - text figure 15 from page 562 of Philosophical Transactions of the Royal Society A, volume 193 (1899) from a paper by Ewing and Rosenhain 'On the crystalline structure of metals', and figure 1, plate 2, facing p240 of Philosophical Transactions A, volume 200 (19902) from 'The effect of strain on the crystalline structure of lead' by Humphrey. |