Elements of science and art: being a familiar introduction to natural philosophy and chemistry; together with their application to a variety of elegant and useful arts, Volum 2

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Printed for F. C. and J. Rivington, 1822
 

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Side 355 - The circumference of every circle, whether great or small, is supposed to be divided into 360 equal parts, called degrees ; and every degree into GO parts, called minutes; and every minute into 60 seconds. To measure the inclination of lines to each other, or angles, a circle is described round the
Side 360 - are said to be proportional, when the ratio of the first to the second is the same as that of the second to the third. Thus, 2, 4, 8, are proportional, because 4 is contained in 8 as many times as 2 is in 4.
Side 398 - am not afraid that I shall repeat it too often. You must have no dependence on your own genius. If you have great talents industry will improve them: if you have moderate abilities, industry will supply their deficiency.
Side 398 - There is one precept," he observes, " in which I shall be opposed only by the vain, the ignorant, and the idle. I am not afraid that I shall repeat it too often. You must have no dependence on your own genius. If you have great talents industry will improve them: if you have moderate abilities, industry will supply their deficiency.
Side 394 - that a great part of every man's life must be employed in collecting materials for the exercise of genius. Invention, strictly speaking, is little more than a new combination of those
Side 397 - have an easy communication, and gracefully follow each other with such natural negligence, as to look like the effect of chance, and at the same time show the figure under it to the utmost advantage. In the higher style of painting, the difference in the materials
Side 396 - is what we call invention in a painter. In the conception of this ideal picture, all the little circumstances should be contrived in such a manner, that they shall strike the spectator no more than they did himself in his conception of the story. Thus there must be a principal object, which should receive the principal mass of light;
Side 362 - into two equal parts. From the points A and B as centres, and with any opening of the compasses greater than half AB, describe arches cutting each other in c and d. Draw the line cd ; and the point E, where it cuts AB, will be the middle required.
Side 302 - over the rivets and edges of the sheets of copper in large boilers, to serve as an additional security to the joinings, and to secure cocks, &c. from leaking, is made by mixing pounded quick-lime with ox's blood. It must be applied fresh made, as it soon gets hard.
Side 297 - or ammoniacum, which must be rubbed or ground till they are dissolved; then mix the whole with a sufficient heat; keep it in a phial stopt, and when it is to be used set it in hot water. A Cement

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