Greenback

This article was originally written and submitted as part of a Canada 150 Project, the Innovation Storybook, to crowdsource stories of Canadian innovation with partners across Canada. The content has since been migrated to Ingenium’s Channel, a digital hub featuring curated content related to science, technology and innovation.

Mar 21, 2017

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By: Ingenious - Ingénieux

Greenback / © Archives de la ville de Montréal

The un-counterfeitable dollar.

Why are American dollar bills green? The answer came from McGill University in Montreal in 1861. That year, the United States Congress authorized production of $50 million in demand notes, largely to cover the federal government’s burgeoning war expenses. The next year, Thomas Sterry Hunt - an American chemist working for the Canadian Geological Survey at McGill - came up with the idea of using chromium ses quioxide for banknote ink. Hunt discovered that, when used as ink for the notes, the compound’s green pigment could not be bleached by acid, thus making it incredibly durable. Nor could it be photographed, making it impervious to counterfeiting. Hunt’s innovation was the straightforward use of science to solve an everyday problem. And with his discovery, the un-counterfeitable dollar - the greenback - was born. In Canada.

“Worth Defending” – A brief look at the 1954 advertising campaign of a major Canadian aircraft manufacturing firm, Canadair Limited of Montréal, Québec, part 4

The advertisement “La liberté d’expression,” in English “Freedom of Speech,” published by Canadair Limited of Montréal, Québec, as part of its 1954 Worth Defending advertising campaign. Anon, “Canadair Limited.” La Presse, 13 April 1954, 25.

“Worth Defending” – A brief look at the 1954 advertising campaign of a major Canadian aircraft manufacturing firm, Canadair Limited of Montréal, Québec, part 3

“Freedom of Worship,” one of the advertisements issued by Canadair Limited of Montréal, Québec, as part of its 1954 Worth Defending advertising campaign. Anon., “Canadair Limited.” The Vancouver Province, 5 January 1954, 5.

“Worth Defending” – A brief look at the 1954 advertising campaign of a major Canadian aircraft manufacturing firm, Canadair Limited of Montréal, Québec, part 2

One of the advertisements issued by Canadair Limited of Montréal, Québec, as part of its 1954 Worth Defending advertising campaign. Anon., “Canadair Limited.” Toronto Daily Star, 6 October 1954, 4.

“Worth Defending” – A brief look at the 1954 advertising campaign of a major Canadian aircraft manufacturing firm, Canadair Limited of Montréal, Québec, part 1

William Wallace Denslow’s lavishly illustrated booklet Through Foreign Lands with ‘Sunny Jim.’ https://wwdenslow.blogspot.com/ via Wikipedia.

“Forget that times are tough and grim, cheer up and smile with Sunny Jim” – The crunchy saga of Force Food Company’s Force, the 1st commercially successful wheat flake breakfast cereal on Earth, part 3

A typical advertisement issued by Force Food Company which featured Sunny Jim and, in this case, his spouse. Anon., “Force Food Company.” St. Louis Globe-Democrat, 23 September 1902, 3.

“Forget that times are tough and grim, cheer up and smile with Sunny Jim” – The crunchy saga of Force Food Company’s Force, the 1st commercially successful wheat flake breakfast cereal on Earth, part 2

The roadster of the Société anonyme des automobiles électriques, Concours des véhicules électriques, Paris, France. Charles Dantin, “Automobiles – Les Essais contrôlés de véhicules à traction électrique à accumulateurs (octobre 1924).” Le Génie civil, 27 December 1924, 589.

“Petrol will never kill electricity, especially if the latter is defended by a Kriéger.” Louis Antoine Jules Tony Kriéger and his electric automobiles, including some of the first hybrid vehicles on planet Earth, part 4

The stand of the Compagnie parisienne des voitures électriques at the Exposition internationale de l’automobile, du cycle et des sports, Paris, France. Louis Antoine Jules Tony Kriéger was at its entrance. Anon., “Le Salon de l’automobile.” Le Monde Illustré, 19 December 1903, 551.

“Petrol will never kill electricity, especially if the latter is defended by a Kriéger.” Louis Antoine Jules Tony Kriéger and his electric automobiles, including some of the first hybrid vehicles on planet Earth, part 3

Louis Antoine Jules Tony Kriéger, on the left, at the wheel of an Électrolette a few moments before the beginning of his journey between Paris and Chatellerault, France. Georges Prade was at his side. Georges Prade, “Les records électriques.” La Vie au Grand Air, 27 October 1901, 638.

“Petrol will never kill electricity, especially if the latter is defended by a Kriéger.” Louis Antoine Jules Tony Kriéger and his electric automobiles, including some of the first hybrid vehicles on planet Earth, part 2

A typical hybrid vehicle of the Compagnie parisienne des voitures électriques of Paris, France. Lucien Fournier, “La voiture mixte Kriéger.” La Locomotion automobile, 7 July 1904, 422.

“Petrol will never kill electricity, especially if the latter is defended by a Kriéger.” Louis Antoine Jules Tony Kriéger and his electric automobiles, including some of the first hybrid vehicles on planet Earth, part 1

An Institute for Aerospace Research staff member conducting an inspection on a Shuttle Remote Manipulator System, or Canadarm, around 2000. National Research Council Canada.

“It is only with the DAIS that one can see rightly; what is essential is invisible to the eye” – A respectful look at a great Canadian aerospace invention, the Diffracto DAIS non destructive testing equipment, and a bit more, part 2

$A technician conducting the first corrosion detection trial, on a Boeing Model 727 test airframe, using a Diffracto DAIS-500 non destructive testing equipment, 1992. National Research Council Canada.$

“It is only with the DAIS that one can see rightly; what is essential is invisible to the eye” – A respectful look at a great Canadian aerospace invention, the Diffracto DAIS non destructive testing equipment, and a bit more, part 1

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