Show inventor of portland cement isaac charles johnson John sou the inventor ot of portland cement Is still living in gravesend Grave send eng and active at the age of 0 98 he was born in the year 1810 mien vohen george was king and jefferson was president and when napoleon was at the zenith of his po power mr johnson won an education under tinder many difficulties as his parents were nvere poor in early manhood he became an architect and a house which he ha built in the Eliza elizabethan bethar style is still standing at Swans court in kent it was at this time that lie first invented portland cement which was first in into this country by levi lev P morion |