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Powder mills were originally powered by windmills, water mills or horse mills. Despite later availability of steam engines, the older power sources did not require a fire to generate steam, and avoided the possibility of sparks which might ignite the gunpowder. Some 20th-century powder mills used electric power.
A 4 by 6 feet (1.2 m × 1.8 m) tunnel 1,200 feet (370 m) long was dug in 1863 to bring water from the dam through the powder works. Water powered powder mill machinery and was used to dissolve and purify the crude potassium nitrate from Chile.
He was a member of the same Masonic lodge as one of the last owners of the wire-drawing mill. [F 4] The powder mill operated in the buildings and with the staff of the former wire-drawing mill, whose mills, rebuilt in 1787, [G1 1] powered the hammers used to crush and mix saltpeter, charcoal, and sulfur, which constituted the basic ingredients ...
The Frankford Powder-Mill is a historic gunpowder factory in the Frankford neighborhood of Philadelphia, Pennsylvania. At the time it was built in 1774 by Oswald Eve, it was the only such mill in the American colonies. Other powder mills operated in the 17th and 18th centuries but stopped production after the French and Indian war.
The Sibley cotton mill was built on the site as a private venture in 1880–82, using bricks from the demolished powder works, and became one of the largest and most successful cotton mills in the region. [5] It manufactured denim until 2006, and the mill's water-driven turbines still generate electricity which is sold to Georgia Power.
The Continental Powder Works at French Creek is a historic gunpowder manufacturing complex in East Pikeland Township, Chester County, Pennsylvania.Constructed on French Creek in early 1776 and intended to supply the Continental Army during the American Revolutionary War, the mill was the only powder mill and gun factory commissioned by the Continental Congress.
American Powder Mills (1883–1929) was a Massachusetts gunpowder manufacturing complex on the Assabet River. It expanded to include forty buildings along both sides of the river in the towns of Acton , Concord , Maynard , and Sudbury .
SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. [9] [10] The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. [11]