Rule of thumb

Definition and stakes

Charles Hardy,  The Aural System

“ A very high classical authority coupled “ratio et oratio” reason and speech as complements and indubitably speech can only improve and develop as the mind unfolds and matures. Those who adopt the new method appear to think the limitations imposed by the immature child’s mind worthy of imitation when dealing with the riper adult. Rule of Thumb has the advantage that being born of and acquired by p. 12practice it can be applied and put into practice, but it is certainly rather late in the day to revert to it in the acquirement of languages. ”
Source: Gutenberg

C. Stansfeld Hicks,  The Boy's Own Book of Indoor Games and Recreations

“ If it sink to the bottom of the pail, your leaden weight is too heavy, and you must cut away a portion—not too much, however, as that would destroy the balance you want to arrive at, and which is necessary to success. No rule other than what is called ‘rule of thumb’ can be set down for your guidance; but care, thought, and attention being given, you are sure to succeed at last. ”
Source: Gutenberg

Various,  The British Journal of Photography…

“ So much, then, for the ears. The next point we come to is the hands in general. I have little to say about them, but then we come to a most important part of the question, one which my learned friend with great solemnity said more than once he thought was of the greatest importance—that is the question of the thumb. And I ask your attention to the way in which this has arisen, and the charge made in connection with it. It is the thumb of the left hand. You saw the plaintiff in the box. ”
Source: Gutenberg

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