the method employed by Mr. Cleveland, of the Dixon Company, at Jersey City, in the production of Dixon's American graphite pencils : —
The graphite is purified by various means, according to the nature of the foreign matter it may contain.
Ticonderoga graphite ground fine in water is treated with sulphuric and nitric acids, and, after washing clean, heated to a bright red. See graphite.
It is then mixed with water until thin enough to run very freely, and the mixture turned slowly into ven iron, though a trace of the latter metal is often found in it. Samples of Ceylon plumbago are shown containing 98.55 pure carbon.
See graphite.
Plumbago was formerly a monopoly in the Cumberland mines, but the mines of Russia, Ceylon, Ticonderoga, Greenland, California, Spain, and Bohemia have fortunately arrested imposition.
See pencil.
Plumb-bob.
Plumb-bob.
A conoidally shaped piece of metal suspended by a cord attached to its upper end, and used for determining vertical, o
onsides, Canonicus, Mahopac, Monadnock, Minnesota, Colorado, Mohican, Tuscarora, Wabash, Susquehanna, Brooklyn, Powhatan, Juniata, Seneca, Shenandoah, Pawtuxet, Ticonderoga, Mackinaw, Maumee, Yantic, Kansas, Iosco, Quaker City, Monticello, Rhode Island, Sassacus, Chippewa, Osceola, Tacony, Pontoosuc, Santiago de Cuba, Fort Jackson,adilla, Pequot.
Seneca, Pontoosuc, Yantic, and Huron took positions to the northward and eastward of the monitors, and enfilading the works.
The Shenandoah, Ticonderoga, Mackinaw, Tacony, and Vanderbilt took effective positions as marked on the chart, and added their fire to that already begun.
The Santiago de Cuba, Fort Jacd by a vessel near her that had not found her right place.
The Mohican went into battle gallantly, and fired rapidly, and with effect; and when the Powhatan, Ticonderoga, and Shenandoah got into their positions they did good service.
The Pawtuxet fell handsomely into line, and did good service with the rest, and the Vanderbilt
