"Electro-Magnetic Engine moving upon a Circular Railway"

(CHEMISTRY). MATHER, DR. WILLIAM. Chemical Lectures. A Lecture, introductory to a course...[Caption title & partial text]. Broadside, 9" x 12". N.p: 1845. Slight browning, but very good. $275.00

Place and date not filled in, but 1845 printed. Mather was from Fairfield, N.Y., (apparently not William Williams Mather).In his "Chemical Lectures" he demonstrated various electro-magnetic apparatus, including an engine "moving upon a Circular Railway."