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Updated: June 8, 2025
The reader can hardly have failed to notice that the old Anchor Tavern had become the focal point where a good deal of mental activity converged.
The focal point of the breath, that forms simultaneously the attack and the body of the tone, by the operation of the abdominal breath pressure against the chest, is always firmly placed on, beneath, or behind the nose. Without body even the finest pianissimo has no significance. The very highest unmixed head tones are an exception, and they can express nothing.
The fertile areas were the terminals of departure and destination where trade tends to be crowded, and in a secondary degree the focal points where, owing to the conformation of the land, trade tends to converge. The infertile areas were the great routes which passed through the focal points and connected the terminal areas. Consequently attack on commerce tends to take one of two forms.
He says: "Having procured a lens of twelve inches diameter and twenty inches focal distance, I proceeded with great alacrity to examine, by the help of it, what kind of air a great variety of substances, natural and factitious, would yield.... With this apparatus, after a variety of other experiments.... on the 1st of August, 1774, I endeavoured to extract air from mercurius calcinatus per se; and I presently found that, by means of this lens, air was expelled from it very readily.
The essentials of a good stand camera are that it shall be rigid, possess a rising and falling front, a swing back, and bellows which will be capable of extension to fully double the focal length of the lens to be used with it. Prof. Petrie is not responsible for this section, which is due to the kind assistance of some professional photographers.-ED.
Thus the magic of personal influence of all kinds would have radiated from it in omnipresent and colliding circlets forever, as the mighty imponderable agents are believed to radiate from some hidden focal force.
In other words, the greater the volume, the more difficult it is to make an effective percentage impression. Similarly, it will be observed that the strain of trade defence was proportioned not to the volume of that trade, but to the number and exposure of its terminals and focal points.
He now zealously devoted himself to the improvement of the achromatic telescope; and, after a prolonged study of the theory of lenses, and many toilsome experiments in the manufacture of flint-glass, he succeeded in perfecting, December 12, 1817, an object-glass of exquisite quality and finish, 9-1/2 inches in diameter, and of 14 feet focal length.
One spot or circumference there should be toward which through the suppression of other parts the eye is led at once. When there, even though the vision has passed far into the canvas, one is at the focal point only, the true goal of the pictorial intention. Any element which proves too attractive along this avenue of entrance is confusing to the sight and weakening to the impression.
No matter what shape the vessel may have, if the exhaustion be low, a filament mounted in the globe is brought to the same degree of incandescence in all parts; but if the exhaustion be high and the bulb be spherical or pear-shaped, as usual, focal points form and the filament is heated to a higher degree at or near such points.
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