Fire extinguisher / hand grenade. Blue glass bottle, round, necked, 4 footed, snifter type. The words “Hardens Hand Fire Extinguisher Grenade” are embossed on the side.
This bottle would have been purchased filled with salt water or carbon tetrachloride and sealed with a cork and cement. In the event of a small fire, the user would throw one or two of these at the base of the fire to attempt to extinguish the blaze before it spread.