Hot water bottle

Definition and stakes

B. G. Jefferis and J. L. Nichols Searchlights on Health — How to Apply and Use Hot Water in All Diseases (1919)

THE HOT WATER BOTTLE. No well regulated house should be without a hot water bottle. It is excellent in the application of hot water for inflammations, colic, headache, congestion, cold feet, rheumatism, sprains, etc., etc. It is an excellent warming pan and an excellent feet and hand warmer when riding.
Source: Wikisource

Household Administration, Its Place in the Higher Education of Women

It has been assumed by some people that if the hot-water bottle be not completely filled, that if what they consider to be sufficient room is left for the expansion of the water, no harm can result from putting the bottle into the oven, but no arrangement can make such a course safe.
The bursting of the kitchen boiler is an accident resulting from disregard of the phenomena of heated water. It sometimes happens that the hot-water supply of the various taps in the house fails. If the boiler supplying the water is a hand-fed one some one whose duty it was to fill it has neglected that duty.
Source: Gutenberg

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