The Melting Furnace
Estellville Glass Factory
—Estell Manor Park —
The furnace was at the center of the building. Before use, wood was dried and stored in the northeast corner of the building. The fire of the furnace was stoked with wood by men standing in the stoke pits below floor level, on the east and west sides. The fire was intense, with a powerful draft. A glassblower at a plant in Clayton recalled seeing a man sit down to eat a sandwich, only to have it whisked out of his hands and up the chimney.
The raw material had to be prepared before being mixed. The sand was dried and heated in sand kilns, probably in the southeast corner of the building. The lime was prepared in the lime kiln, located south of the Flattening House. The potash was removed from the furnace after firing s and stored until used. The materials were mixed to form the batch as they were needed.
The batch was melted in pots placed on a masonry platform above the fire in the furnace, called the “siege”. Wooden platforms referred to as “benches” were built on the north and south sides of the furnace; these provided access to the molten glass inside the furnace, and gave the glassblowers elevated stations from which to work.
Glassblowing was team effort
The glassblowers were master craftsmen, who took great pride in their work. They needed the strength to wield the 100 pounds of blowpipe and molten glass, and the skill to turn the glob of glass into a cylinder ten inches across and five feet long, with sides a uniform thickness of 1/8 inch, all within five to ten minutes.
This feat was performed as the glassblower stood on the elevated bench, working over the swing pit, which was about three feet deeper than the floor level. The cylinder was formed through a combination of blowing through the pipe, and swinging it over the pit to elongate the piece of glass through centrifugal force.
Some glassblowers chained themselves to posts to counteract the weight of the glass. Others disdained such precautions,
When the wall of the cylinder was a uniform thickness the cylinder was removed from the blowpipe and prepared for annealing and flattening.
The blowers of window glass cylinders were regarded as the masters of glassblowing. The five-foot long cylinders could tolerate a few imperfections, unlike the less critical bottle glass. A glassblower was paid not according to how many cylinders he blew, but according to how many boxes of usable glass were cut from his cylinders, he was not compensated for imperfections and thickness out of tolerance.
Location. 39° 23.433′ N, 74° 44.522′ W. Marker is in Estell Manor, New Jersey, in Atlantic County. Marker is on New Jersey Route 50. Touch for map. The marker is in Estell Manor Park on Purple Heart Drive. Marker is in this post office area: Estell Manor NJ 08319, United States of America.
Other nearby markers. At least 8 other markers are within 5 miles of this marker, measured as the crow flies. The Flattening House (a few steps from this marker); The Pot House (within shouting distance of this marker); Estellville Glass Factory (about 300 feet away, measured in a direct line); The Daniel Estell House (approx. 0.4 miles away); Welcome to Atlantic County Park at Estell Manor! (approx. half a mile away); The Estellville Methodist Church (approx. 0.6 miles away); Bethlehem Loading Co. (approx. 1.1 miles away); George Wheaton’s Shipyard (approx. 4.3 miles away). Touch for a list and map of all markers in Estell Manor.
Categories. • Industry & Commerce •
Credits. This page was last revised on June 16, 2016. This page originally submitted on January 25, 2016, by Don Morfe of Baltimore, Maryland. This page has been viewed 231 times since then and 16 times this year. Photos: 1, 2, 3. submitted on January 25, 2016, by Don Morfe of Baltimore, Maryland. • Bill Pfingsten was the editor who published this page.