Other very early toilets that used flowing water to remove the waste are found at Skara Brae in Orkney , Scotland, which was occupied from about BC until BC. Aircraft lavatories and passenger train toilets were in the past often designed as chemical toilets but are nowadays more likely to be vacuum toilets. In some places, users are encouraged not to flush after urination. Ross 's arguments that it derived in some fashion from the site of Napoleon 's defeat. University of Wisconsin Press. They do not require a connection to a water supply and are used in a variety of situations.
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