As a matter of fact, the British believe brewers in the past did exactly that, dipping their thumb into the beer to test its temperature and taste, and thus gave rise to the phrase.
There are other theories as pointing to the origins of the rule of thumb. The simplest as well as the most plausible one comes from carpentry. Well, we can all imagine a carpenter in the old days using their thumbs and fingers as a form of measurement, before modern rulers and measurements come about.
When a carpenter deems that he needs a stick that’s one and half in thickness and five thumbs in length, for example, he knows exactly what he wants. By modern standards, though, that’s not being exactly precise.
That’s the thing with “rule of thumb” – it may not be 100 percent accurate, but, usually, it suffices the situation.
Here, media examples of people who apply this rule in their lives:
1. The cruise industry bills cruising as a great value. For one upfront price, your accommodations, meals and trip are paid for.
But most cruisers end up spending more. Carolyn Spencer Brown, editor of CruiseCritic.com, says her rule of thumb is to assume she’ll spend half the amount of the cruise fare on incidentals. She recommends an online cruise budget calculator to help estimate all your costs.
Wendy Perrin, consumer news editor at Conde Nast Traveler magazine, also cautions that “the cruise fare you see advertised is not the price you’ll end up paying. The advertised fare, which is usually for the smallest, windowless cabin, does not include mandatory taxes and port fees, mandatory gratuities, or highly recommended additional charges, such as cruise insurance.”
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