Tommy cooker

A Tommy cooker was a compact, portable stove, fuelled by something referred to as "solidified alcohol" which was issued to British troops (Tommies) in World War I. It was notoriously ineffective; one soldier complained that it took two hours to boil half a pint of water. A variety of commercial or improvised alternatives were in use.
A refined version remained in use during World War II, using gelled fuel in a tin can; a steel ring fitted to the can supported a mess tin.
Until recently the British army still used compact portable solid fuel (hexamine) stoves, until replaced by the BCB Fire Dragon alcohol gel fuel stove.
The term also came to be applied by the German tank crews as a derogatory nickname for the Sherman tank whose earlier models acquired a reputation for bursting up in flames when hit, due to improper ammunition storage.
WWI "Rations Heater - Personal Cooker".
The British cookers were made by Tommy's Cooker Co., Limited, The Little Kitchener Co. and the "Pals" Cooker by Matthias Jackson & Sons.
WWII "Rations Heater - Personal Cooker".
British cookers used by individuals were generally known as "Tommy Cookers" and came in a number of different forms. The two most popular designs used were:
Cylindrical tin container, an inscription reads; "SOLID FUEL COOKER (Stand, Disc & Tablets), INSTRUCTIONS INSIDE".
The tin is black and measures 4 1/2" in height and 2 1/2" in diameter.
The entire item weighs 309g.
The instructions inside are like a newspaper cutting and say the following;