Review: Thomas Jefferson, Landscape Architect by Frederick Doveton Nichols, Ralph E. Griswold; Civilizing American Cities: A Selection of Frederick Law Olmsted's Writings on City Landscapes by S. B. Sutton, Frederick Law Olmsted; Open Spaces: The Life of American Cities by August Heckscher, Phyllis Robinson; Cambridge, Massachusetts: The Changing of a Landscape by Alan Emmet; Landscapes and Gardens for Historic Buildings: A Handbook for Reproducing and Creating Authentic Landscape Settings by Rudy J. Favretti, Joy Putnam Favretti

1981 ◽  
Vol 40 (1) ◽  
pp. 73-75
Author(s):  
Cynthia Zaitzevsky
Author(s):  
Paulina Flasińska

Flammable substances may form explosive atmospheres when mixed with air. To prevent their formation or minimise the risk of their occurrence, it is necessary to understand the properties of the mixtures of flammable substances and to apprehend the properties characterising the course of a potential explosion. To minimise the risk of a fire or an explosion, a process called inerting is used in which, e.g. nitrogen plays the role of an inert agent. The article discusses the method for testing the flammability limits, the “bomb” method, in accordance with the European standard PN-EN 1839 and the limiting oxygen concentration (LOC) according to the European standard PN-EN 14756. The study shows the influence of inert gas on the flammability range of selected substances: hydrogen, methane, and hexane, which in practice allows the assessment of the explosion hazard of closed and open spaces, the establishment of safe working conditions, and the selection of equipment operating in given explosion hazard zones. The tests were carried out at 25 °C for hydrogen and methane and at 40 °C for hexane, at ambient pressure.


2019 ◽  
Vol 9 (1) ◽  
pp. 18-25 ◽  
Author(s):  
Katarzyna Kafel ◽  
Agnieszka Leśniak ◽  
Krzysztof Zima

AbstractOver time, historic buildings are exposed to various destructive mechanisms brought about by a wide range of damaging factors. Costs and methods of reinforcing their individual components are, among others, an important issue. The term "reinforcement" is linked with the concept of conservation, which stands for the actions taken with the aim of preserving a building. It provides a well-articulated system consisting of activities that lead to the reinforcement of the structure, usability enhancement or to the improvement of its carrying capacity. This article analyses the selection of an appropriate brick pillar reinforcement method, taking into account accepted evaluation criteria.


1922 ◽  
Author(s):  
Frederick Law Olmsted ◽  
Theodora Kimball Hubbard ◽  
Frederick Law Olmsted

1922 ◽  
Author(s):  
Frederick Law Olmsted ◽  
Theodora Kimball Hubbard ◽  
Theodora Kimball Hubbard ◽  
Frederick Law Olmsted

Author(s):  
Darius Kalibatas ◽  
Jurgis Zagorskas ◽  
R Skripkien ◽  
Ar Barvidas ◽  
Aivaras Jasiulevis

Author(s):  
Frederick Law Olmsted ◽  
Theodora Kimball Hubbard ◽  
Frederick Law Olmsted

Author(s):  
Gwynne Tuell Potts

Weeks before Thomas Jefferson learned he had successfully purchased Louisiana, his secretary wrote William Clark to invite him to cocaptain an exploration of the territory. The preparations for the adventure, the selection of Louisville-area young men accustomed to hard living, and the gathering of supplies consumed Clark and the area until the two captains shoved away from the Falls in a driving October rain. The Lewis and Clark Expedition is a seminal moment in the development of the United States of America, and it was Clark’s brothers and brothers-in-law who received steady, if erratic, news of the uncharted continent between 1803 and 1806. The explorers, along with their Native entourage, arrived at the homes of Jonathan Clark and William Croghan before beginning their separate treks to Washington City, where they reported their stunning findings to Thomas Jefferson.


1971 ◽  
Vol 25 (4) ◽  
pp. 114
Author(s):  
Steven Dotterrer ◽  
S. B. Sutton ◽  
Frederick Law Olmsted
Keyword(s):  

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