1848 Lines of Equal Polarization by A Keith Johnston

22 x 26" full folio Steel Engravings, state of the art for 1848, From A Keith Johnston of Edinburgh, Uk . From what is perhaps the first full folio atlas focused on the geophysical World. With hand water colored maps for the articulation of the sciences represented, a laborious and expensive task at the time , on top of engraving using a newly applied intaglio process using the new industrial material, Steel. Cutting edge and handsome offerings for any scientist, aged or aspiring. Fine Condition this map folio includes its supporting academic text page(s) .