"Irons that are heated by natural gas, denatured alcohol, kerosene and gasoline are categorized as liquid fuel irons. The irons that were heated with these fuels could readily be ignited and the heat could be controlled. Since little or no smoke and soot was produced, liquid fuel irons represented a major improvement over charcoal irons." David Irons, Irons By Irons, page 108.

Coleman Model 4A Gasoline Iron

Coleman gas iron, model 4A, with red porcelain finish and red handle (rarest color). Includes trivet, filler can and wrench. Sold by Hartzell's Auction Gallery at the Balestri Auction on 7/12/18 for $130.

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Firing Up a Coleman No.4 Gasoline Iron. Video by 2soldierman2 on YouTube

German Feldmeyer Methylated Spirit (Alcohol) Iron

Model 1903 Brilliant, circa 1890/1900, plus original case and accessories. The iron and trivet are of nickel-plated cast iron. Note that the trivet in this set has no handle. Here is the Brochure that was included with this set.

The contents are in good condition and the iron appears to be only lightly used, if ever. Dimensions of the outside case size are 10.5" x 7.25" x 3". The leather handle has separated from its attachment on one side and the latch does not close. The case is intact; the inside is lined with green felt. 

The Omega Spirit Iron, German, circa 1910. Video by T C Burgt on YouTube