Comments for eGrejeen

Comment on Frescoes Painting in Aegean Art by cleopatra comin at ya

cleopatra comin at ya — Tue, 23 Apr 2013 15:03:24 +0000

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Comment on Synthetic Abrasives by Elayabarathi

Elayabarathi — Thu, 04 Apr 2013 14:56:10 +0000

Edward G. Acheson invented the first synthetic abrasive in 1891. While searching for a way to make artificial diamonds, Acheson mixed clay and carbon, and then heated the mixture to create silicon-carbide crystals harder than all other substances except diamond. Since the early 1900s synthetic abrasives have been used more widely than natural abrasives. The synthetics can be produced cheaply and, if necessary, in large quantities. Among the most important are silicon carbide, aluminum oxide, and boron carbide. Silicon carbide, also called Carborundum, is widely used for making grinding wheels. Aluminum oxide, made from bauxite, is used for cutting hard metals. Boron carbide, a compound of boron and carbon, is one of the hardest abrasives. Carbide-coated products include saw blades and drill tips. Synthetic diamonds, first developed in 1955, are used in many types of drill bits and tool sharpeners. Synthetic Abrasives are however significant for shaping and cutting metals and other objects.

Comment on Synthetic Abrasives by Elayabarathi

Elayabarathi — Thu, 04 Apr 2013 14:54:33 +0000

synthetic abrasives

Comment on Abraham Lincoln, a Wartime President by Nick

Nick — Wed, 20 Mar 2013 19:28:00 +0000

Thanks this helped me with my essay on Abraham Lincoln.

Comment on Air Warfare: World War I by http://tinyurl.com/theibeirn09078

http://tinyurl.com/theibeirn09078 — Tue, 05 Feb 2013 01:50:43 +0000

Exactly how much time did it acquire u to publish “Air Warfare:
World War I – eGrejeen”? It comes with an awful lot of decent material.

Many thanks ,Dolores

Comment on Transportation in Africa by Equipment & Transport | AfroXpo

Equipment & Transport | AfroXpo — Sat, 02 Feb 2013 00:29:21 +0000

[...] On the other hand, transportation in Africa is still very basic. The quality and connectivity of African roads and railroads remain poor: Most roads are made of dirt or gravel, and good quality all-weather roads are limited. Colonial rulers laid railroad tracks to connect ports to export-producing areas in the interior, and these networks have been largely unexpanded since independence. Few roads and tracks cross international boundaries in Africa. The poor condition and disjointedness of the road and rail networks have hindered African economic development. South Africa, with higher-quality roads and a greater degree of road and rail connectivity, is a notable exception.[2] [...]

Comment on Effects of Acid Rain on Plants and Animals by Mayflies Make Good Eating For A Lot Of Fish And Birds « docdavis15

Mayflies Make Good Eating For A Lot Of Fish And Birds « docdavis15 — Tue, 22 Jan 2013 05:47:51 +0000

[...] Effects of Acid Rain on Plants and Animals (egrejeen.wordpress.com) [...]

Comment on Trans-Saharan Trade in Africa by On Trans-Saharan Trails: Islamic Law, Trade Networks, and Cross-Cultural Exchange in Nineteenth-Century Western Africa SocioLingo Africa

Fri, 18 Jan 2013 22:19:38 +0000

[...] Trans-Saharan Trade in Africa (egrejeen.wordpress.com) [...]

Comment on African American History: Differing Racial Perceptions by January 6–On This Day in Mississippi History . . . | Mississippi PEP

January 6–On This Day in Mississippi History . . . | Mississippi PEP — Sun, 06 Jan 2013 14:23:42 +0000

[...] African American History: Differing Racial Perceptions (egrejeen.wordpress.com) [...]

Comment on Effects of Acid Rain on Human-Made Structures by Effects of Acid Rain – eGrejeen

Effects of Acid Rain – eGrejeen — Tue, 18 Dec 2012 23:53:47 +0000

[...] Effects of Acid Rain on Human-Made Structures (egrejeen.wordpress.com) [...]