From advanced insulation foams to multiwall cladding, this next generation of high-performing materials will help accelerate energy-efficient design.
The 12 principles published here are explained in detail in the book Permaculture: Principles and Pathways Beyond Sustainability , by David Holmgren. In , Australian ecologists David Holmgren and Bill Mollison coined for the first time the concept of permaculture as a systematic method. For Mollison, "permaculture is the philosophy of working with and not against nature, after a long and thoughtful observation. In , Holmgren published the book Permaculture : Principles and Pathways Beyond Sustainability , defining 12 design principles that can be used as a guide when generating sustainable systems.
These principles can be applied to all daily processes in order to humanize those processes, increase efficiency, and in the long term ensure the survival of mankind. Enthusiasm for water and energy data collection for commercial and residential buildings has been growing strong across the U. About Contact Submit Advertise. Change country. Log out. By monitoring these properties over the past 20 years and working with individuals and organizations trying to preserve them, we have learned many valuable lessons.
Those lessons are called out throughout this publication.
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By , the toll bridge carried trolleys that transported passengers between the west shore of the Susquehanna River and the state capital, as well as foot traffic and horse-drawn vehicles. The bridge also enabled recreational development on City Island in the early 20th century, including baseball, football and track, as well as picnicking, swimming and boating. With evolutions in popular modes of transportation and periodic damage from storms and floods, owners of the Walnut Street Bridge have dealt with minor structural problems since about After overcoming resistance by the private property owner, the Commonwealth finally acquired the toll bridge in They continued to collect tolls on the bridge until The bridge was listed in the National Register of Historic Places in That same year, flood waters from Hurricane Agnes caused severe damage to the bridge, and it was closed to vehicular traffic.
The Walnut Street Bridge was one of the longest pedestrian bridges in the world. In January of , the Walnut Street Bridge was again seriously damaged by ice-dammed flood waters. Three metal trusses were destroyed, and the piers that had supported them were removed. Overwhelming local support and extraordinary stewardship by the Commonwealth resulted in the rehabilitation of the remaining eastern spans, which provide pedestrian access between downtown Harrisburg and City Island facilities.
The bridge is used by over one million visitors, tourists, and residents each year. The City of Harrisburg, which is responsible for the maintenance of the bridge, is currently unable to devote financial resources to this project. Fortunately, a coalition of residents, area businesses, and other partners, known collectively as Lighten Up Harrisburg, is working to illuminate the historic Walnut Street Bridge and address other urgent safety needs. In , metal truss bridges statewide were recognized by Preservation Pennsylvania as an endangered resource; many truss bridges were at risk for replacement due to strength deficiencies, size limitations, deferred maintenance and the high cost of repairs.
In , truss bridges in Pennsylvania were eligible for or listed in the National Register. While not all metal truss bridges can and should be saved, some may be strengthened to continue to serve the community. In reaction to concerns about the shrinking population of metal truss bridges in Pennsylvania, PennDOT is currently working to develop a management plan to help maintain the bridges and prioritize select bridges for rehabilitation rather than replacement.
The plan seeks to balance sound engineering with historic preservation considerations in evaluating the level of significance and the rehabilitation potential for each bridge.
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PennDOT anticipates that the plan will be an invaluable tool to be used throughout their planning and project development process. Theorem painting is the art of making stencils and using them to make paintings on fabric Nancy uses an egg-shelled colored velvet cotton. The appeal of the genre lay in the fact that it allowed the non-professional artist to create a work of art that was acceptable enough to display. These drawings are always drawn freehand, even when she is reproducing a period painting. She uses a piece of the cotton velveteen over her finger, though she does go back over the painting at the end with a detail brush to add defining outlines as needed.
But Nancy does stop there, to have total artistic control over how her paintings are presented she has learned several traditional decorative art techniques she uses to paint the handmade frames for her theorems.
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In true folk art style, Nancy is self-taught — she has learned her craft through studying antique theorems and reproducing them. She became so accomplished at the historical reproductions that she was commissioned and provided Colonial Williamsburg with thirty-three large paintings, which hang in the public and private spaces of the Williamsburg Lodge. After spending some time mastering the reproduction of 19 th -Century theorems, she began to branch out to include her own original designs. Her work was among the few artists asked to contribute their art to decorting the Christmas White House during the Clinton administration.
Amusement parks first appeared in the latter half of the 19th century and quickly became a common and significant form of popular recreation.
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The development of the roller coaster occurred parallel with the development of the amusement park and was signature attraction at nearly all parks. Erected in , Leap-the-Dips is the oldest standing roller coaster and the last known example of a side-friction figure-eight roller coaster in the world. In its heyday, it was one of approximately of its type.
Because of this remarkable significance, Leap-the-Dips was listed in the National Register of Historic Places in and was designated as a National Historic Landmark in Leap-the-Dips was closed in Restoration began in , and Leap-the-Dips reopened at Lakemont Park in Today, the Foundation and owner Leap, Inc.
Proceeds from ridership, fundraising and merchandise sales are used first to pay the debt and then to support operation and maintenance of the historic roller coaster. A number of years ago, we had the very fortunate luck to be given the opportunity to completely restore the Denn House in southern New Jersey. Be sure to check out the pictures at the end of the article that we took just this month of how the Denn House looks today, and the pictures of other Patterned Brick houses in Salem County, New Jersey.
Built as a private home in , the John Maddox Denn house is two stories with the front entrance facing Alloway Creek. Swedes and Finns began arriving in , landing in the New World of what is now Wilmington, Delaware. For twelve years, Salem was a military post of Sweden. A Chandler form the parish of St. The grandson, John Maddow Denn, born in , built the home that we see today, a charming remembrance to England in the days of Cromwell and Charles the Second. William Hancock was a Loyalist to the King, yet the English Calvary had wounded him and massacred the Colonials who had sought shelter in the Hancock House.
The Denn house was put to use as a field hospital. This house is registered in the library of Congress as a National Historic Site. A load of White Oak was purchased from an antique wood dealer. January 13, , Chuck and Lois take a Saturday trip to remove existing windows. Halfway through the process the wind picks up and snow flurries begin.
To begin the process of transformation the wood is run on the planer, making all the sides straight and smooth. Sections are measured, cut and set aside. Next the ends are mortised or tendoned, depending on if it is a vertical or horizontal section of the window frame. Side jambs are tendoned to fit the head and sill mortise. The pieces are sized and glued together.
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Historic Restorations also uses steel clamps to insure that the fit is square and tight as it can be. View cookies policy.
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