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ISO 18265: "Metallic materials — Conversion of hardness values" (2013) ASTM E140-12B(2019)e1: "Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness" (2019)
This emphasis on individuals not workshops can be seen more clearly in 14th century stained glass and was probably to increase the speed of production. Analysis of the glasses has shown they were originally the same colour and corroded identically, meaning that all the glass-painters used the same glass.
The B and C scales overlap, such that readings below HRC 20 and those above HRB 100, generally considered unreliable, need not be taken or specified. Typical values include: Very hard steel (e.g. chisels, quality knife blades ): HRC 55–66 (Hardened High Speed Carbon and Tool Steels such as M2, W2, O1, CPM-M4, and D2, as well as many of the ...
The test complements the measurement of glass transition temperature, as an indirect measure of the degree of cure of a composite. It is inexpensive and quick, and provides information on the cure throughout a part. [1]
In the mid-19th century, Lavers, Barraud and Westlake were among many young designers who responded to the growing market for stained glass windows. The partnership initially comprised Nathaniel Wood Lavers (1828–1911) and Francis Philip Barraud (1824–1900). [note 1] Both were originally employed at the workshops of James Powell and Sons.
Came glasswork includes assembling pieces of cut and possibly painted glass using came sections. The joints where the came meet are soldered to bind the sections. When all of the glass pieces have been put within came and a border put around the entire work, pieces are cemented and supported as needed. [1]
Detail of the Simeon window in St Brendan's Cathedral, Loughrea. The official start of Michael Healy's stained glass career coincided with the opening of An Túr Gloine in January 1903, and for the first two years he executed, or assisted in the execution of, a total of thirteen stained glass windows; in the case of the majority of these he assisted in the painting (often working alongside ...
The Cologne Cathedral Window is the stained glass window in the south transept of the Cologne Cathedral designed by Cologne artist Gerhard Richter. On a surface of 106 square metres, 11,263 glass squares in 72 colours of 9,6 cm × 9.6 cm were principally arranged randomly, with others selected in response to architectural context. [ 1 ]