Poling is metallurgical method employed in the purification of copper which contains copper oxide as an impurity and also in the purification of tin which contains tin oxide (stannic oxide or “SnO2”) as an impurity. The impure metal, usually in the form of molten blister copper, is placed in an…
View More Zambia Philately: 1969 50th Anniversary of the ILO – 25n Poling a FurnaceAuthor: thedigitalphilatelist
Zambia Philately: 1969 50th Anniversary of the ILO – 3n Copper Miner
The Zambian copper mining industry began in the 1920s. Consistent private sector-driven investment in the industry over a period of over 50 years in exploration, mine development and operation, development of minerals processing facilities, building of infrastructure for pyrometallurgical and hydrometallurgical processing, with attendant support facilities, including building of whole…
View More Zambia Philately: 1969 50th Anniversary of the ILO – 3n Copper MinerBahamas Philately: 1962 City of Nassau Centenary (1861-1961) – 10d Nassau Public Library
10d rate paid the airmail rate to U.K. and Europe. Details Subject: Nassau Public Library Designer: Printer: Joh. Enschedé En Zonen Hollande Process: Photogravure Watermark: None Perf: 14 x 13 (comb) Cylinders: None Sheet: R5 x 6 Quantity: 319,478 57,398 (Crown Agent) 262,080 (Local) Sheet Numbers References Bahamas.gov.bs British Caribbean Philatelic…
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American Topical Association: Dr Seuss Goes to War & Before
Join the American Topical Association and Gregg Philipson as he explores Dr. Seuss in his early years as a cartoonist working for Life and Judge magazines, Esso Oil and others. It concludes in 1948 shortly after his service as a Major in the U.S. Army during WWII. It is a…
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American Topical Association: Canadian Medical Groundbreakers
Join the American Topical Association as they present Jean Wang and Medical Groundbreakers of Canada.
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Paul Fraser Collectibles: Top 10 Most Expensive Postage Stamps Ever Sold
Paul Fraser Collectibles take a look at the most expensive Stamps to ever sell.
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The Stamp Channel: Behind The Stamps Episode 6 – Das Waschen von Briefmarken
In dieser Folge zeigt euch Edda Schritt für Schritt, wie man eine Briefmarke von ihrem Couvert ablöst, ohne sie dabei zu beschädigen und wir geben euch Tipps, was dabei alles zu beachten ist, um mögliche Fehler oder Beschädigungen dabei zu vermeiden.
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Ourdadsstamps: What’s in the Magazines?
This week, Ourdadsstamps give a round up of the February editions British stamp magazines and look forward to the London International Exhibition which will finally go ahead from 19th to 26th February.
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Richard Philatelist: The Tube Map Stamp
Richard Philatelist uses the Tube Map Stamp from his first video on YouTube, one year later. He talks about the stories behind this stamp and have a late celebration of his channel’s first birthday (09/01/2021)!
View More Richard Philatelist: The Tube Map StampThematic: Architecture
Architecture is both the process and the product of planning, designing, and constructing buildings or other structures. Architectural works, in the material form of buildings, are often perceived as cultural symbols and as works of art. Historical civilizations are often identified with their surviving architectural achievements. Over the years, the…
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