"Elevation of Hislop's Gas Retort Furnace." — Encyclopedia Britannica, 1893
"Retort setting in Hislop's furnace." — Encyclopedia Britannica, 1893
"Hislop's Scrubber, Sectional Elevation." — Encyclopedia Britannica, 1893
"Hislop's Scrubber, Plan." — Encyclopedia Britannica, 1893