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Elizabeth Cary Agassiz, Louis Agassiz: his life and correspondence, third edition 18 0 Browse Search
Edward L. Pierce, Memoir and letters of Charles Sumner: volume 1 3 1 Browse Search
Raphael Semmes, Memoirs of Service Afloat During the War Between the States 2 0 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 2 2 Browse Search
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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for Ehrenberg or search for Ehrenberg in all documents.

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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
r withhold the meed of praise due to the success of the man and his boy. An Abraham Darby erected the first iron bridge in 1777; it spanned the Severn near Coalbrookdale with a single arch. It is believed that at these works coke and coal were first successfully used in smelting iron. Very small iron castings are made at Berlin, Germany, known as the Berlin iron ornaments and chains. One exhibited in London was 4 feet 10 inches long, had 180 links, and weighed 1 2/3 ounces. Professor Ehrenberg, the renowned microscopist, states that the iron of which they are composed is made from a bog iron-ore, and that the sand is a kind of tripoli, also containing iron. Both are composed of the remains of animalcules. The origin of these interesting works of art was during the struggle between Prussia and France under Napoleon I. The generous ladies gave up their jewels to purchase the necessary armaments, and received in return iron ornaments which bore the inscription, Ich gab G
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
ect is the correction of spherical aberration and chromatic dispersion. See lens. Tri′pod. A three-legged support for a table, chair, surveyor's compass, candelabra, brazier, or other object. Tripod-jack. Tri′pod-jack. A screw-jack supported on three legs, connected to a common base-plate to give them a sufficient bearing. Trip′o-li. 1. A siliceous polishingma-terial first imported from Tripoli, Africa. The tripoli of Bilin in Bohemia has been ascertained by Professor Ehrenberg of Berlin to consist of the siliceous plates or frustules of animalculae and diatomaceae. They are divested of everything but silex, are hard but fragile, and are of different species. Of one kind there are 41,000,000,000 in a cubic inch, weighing 220 grains; 187,000,000 to a single grain. Infusorial earth has been employed in the manufacture of fire-brick and for the lining of furnaces; its adaptation for this purpose is owing to the fact that it contains but a very small propor<