http://etc.usf.edu/clipart/ Free clipart for students & teachers! Welcome to quality educational clipart. Every item comes with a choice of image size and format as well as complete source information for proper citations in school projects. No advertisement-filled pages with pop-up windows or inappropriate links here. A friendly license allows teachers and students to use up to 50 items in a single, non-commercial project without further permission. http://etc.usf.edu/clipart/i/banner.jpg http://etc.usf.edu/clipart/ This website is CoolIris enabled! You can use the CoolIris browser plugin to view the images on this site in an interactive 3D wall.<br><br><br><br> http://www.cooliris.com/ "Formerly the balls were squeezed by an "alligator" or "crocodile" squeezer, and were then "shingled" by shingling hammers, such as the "tilt" hammer (where the hammer forms a lever with the fulcrum i... http://etc.usf.edu/clipart/27900/27992/alligator_27992.htm "Mexican Arrastre. A rude apparatus used in Mexico, and to some extent in the United States, for grinding and at the same time amalgamating ores containing free gold or silver."-Whitney, 1902... http://etc.usf.edu/clipart/15000/15083/arrastre_15083.htm An axe with an adz&mdash;like edge on the end opposite the point. ... http://etc.usf.edu/clipart/25200/25292/pick_axe_25292.htm An axe with an adz&mdash;like edge on the end opposite the point. ... http://etc.usf.edu/clipart/25200/25293/pick_axe_25293.htm A blast furnace measuring 42 feet high and 15 feet across that contains 4356 cubic feet of space.... http://etc.usf.edu/clipart/27900/27961/blast_furnac_27961.htm A blast furnace measuring 47.5 feet high and 16.5 feet across that contains 6174 cubic feet of space.... http://etc.usf.edu/clipart/27900/27962/blast_furnac_27962.htm A blast furnace measuring 55 feet high and 16 feet across that contains 7175 cubic feet of space.... http://etc.usf.edu/clipart/27900/27963/blast_furnac_27963.htm A blast furnace measuring 58 feet high and 17 feet across that contains 8000 cubic feet of space.... http://etc.usf.edu/clipart/27900/27964/blast_furnac_27964.htm A blast furnace measuring 60 feet high and 20 feet across that contains 12778 cubic feet of space.... http://etc.usf.edu/clipart/27900/27965/blast_furnac_27965.htm A blast furnace measuring 75 feet high and 16.5 feet across that contains 11983 cubic feet of space.... http://etc.usf.edu/clipart/27900/27966/blast_furnac_27966.htm A blast furnace measuring 80 feet high and 20.5 feet across that contains 15500 cubic feet of space.... http://etc.usf.edu/clipart/27900/27967/blast_furnac_27967.htm A blast furnace measuring 95.5 feet high and 16 feet across that contains 15050 cubic feet of space.... http://etc.usf.edu/clipart/27900/27968/blast_furnac_27968.htm A blast furnace measuring 95.5 feet high and 22 feet across that contains 25940 cubic feet of space.... http://etc.usf.edu/clipart/27900/27969/blast_furnac_27969.htm A blast furnace measuring 95.5 feet high and 24 feet across that contains 28950 cubic feet of space.... http://etc.usf.edu/clipart/27900/27970/blast_furnac_27970.htm A blast furnace measuring 85 feet high and 25 feet across that contains 26000 cubic feet of space.... http://etc.usf.edu/clipart/27900/27971/blast_furnac_27971.htm A blast furnace measuring 90 feet high and 30 feet across that contains 41149 cubic feet of space.... http://etc.usf.edu/clipart/27900/27972/blast_furnac_27972.htm A machine that blasts hot air to produce temperatures from 600 to 900 degrees Fahrenheit.... http://etc.usf.edu/clipart/44500/44564/44564_blast_furn.htm An illustration of a coal bucket.... http://etc.usf.edu/clipart/65200/65204/65204_coal-bucket.htm "Calder Pipe Stove. I. End Elevation. II. Elevation. III. Plan." &mdash; The Encyclopedia Britannica, 1893... http://etc.usf.edu/clipart/27900/27979/calder_pipe_27979.htm "Cascade Furnace&mdash;Longitudinal Section." &mdash; The Encyclopedia Britannica, 1893... http://etc.usf.edu/clipart/27900/27999/cascade_27999.htm Appearance of the chambers. The miners, when they branch off from the main shaft or avenue, leave pillars of coal about eighteen feet square, to support the roof or mass above. These huge pillars we... http://etc.usf.edu/clipart/13500/13506/chambers_13506.htm The coal-fields of the United States are the richest in the world. Immense deposits occur in the eastern, central, and western sections of the country. ... http://etc.usf.edu/clipart/30800/30840/coal_30840.htm An anthracite coal mine. Anthracite is a variety of mineral coal known by its high luster.... http://etc.usf.edu/clipart/56400/56447/56447_coal_mine.htm Circulation of fresh air was critical in coal mining. In spite of passages created to control this, ther were always side rooms through which no circulation could be effected. These areas were where e... http://etc.usf.edu/clipart/69300/69308/69308_mining_coal.htm A scene in the coal mining region of Pennsylvania.... http://etc.usf.edu/clipart/57700/57734/57734_coal_mining.htm