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2. American Platinum Eagle - Wikipedia

   en.wikipedia.org/wiki/American_Platinum_Eagle

   A 1 ⁄ 10 troy oz. bullion strike bears the .9995 PLATINUM 1/10 OZ. inscription. The 1 ⁄ 10 , 1 ⁄ 4 , and 1 ⁄ 2 troy oz coins are identical in design to the 1 troy oz coin except for the markings on the reverse side that indicate the weight and face value of the coin (for example, .9995 PLATINUM 1 OZ.

3. Trillion-dollar coin - Wikipedia

   en.wikipedia.org/wiki/Trillion-dollar_coin

   Artist's concept of a trillion-dollar coin, featuring a similar obverse design to the reverse of the presidential dollar series.. The trillion-dollar coin is a concept that emerged during the United States debt-ceiling crisis of 2011 as a proposed way to bypass any necessity for the United States Congress to raise the country's borrowing limit, through the minting of very high-value platinum ...

4. American Eagle bullion coins - Wikipedia

   en.wikipedia.org/wiki/American_Eagle_bullion_coins

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

5. .500/465 Nitro Express - Wikipedia

   en.wikipedia.org/wiki/.500/465_Nitro_Express

   The .500/465 Nitro Express is one of several rounds (including the .470 Nitro Express, .475 Nitro Express, .475 No. 2 Nitro Express and .476 Nitro Express) developed as a replacement for the .500/450 Nitro Express following the British authorities' 1907 ban of military caliber ammunition in India and the Sudan, all with comparable performance.

6. .465 H&H Magnum - Wikipedia

   en.wikipedia.org/wiki/.465_H&H_Magnum

   The .500/465 Nitro Express is the only other cartridge with the same bullet diameter as the .465 H&H Magnum. Both cartridges are designed to fire a 480-grain (31 g) .468 caliber (11.89 mm) bullet. Although the cartridge is capable of operating at rather high pressures, Holland & Holland chose to load the cartridge to a moderate pressure of ...

7. Vienna Philharmonic (coin) - Wikipedia

   en.wikipedia.org/wiki/Vienna_Philharmonic_(coin)

   It was introduced in 1989, as a one-troy ounce (ozt) gold coin with a face value of 2,000 Austrian schillings. It is one of the world's best selling bullion coins. [1] [2] In 2002, with the adoption of the euro currency, the nominal value of the one-ounce coin was changed to 100 euros. In 2008, the Mint introduced a one-ounce silver version of ...

8. Adams' catalyst - Wikipedia

   en.wikipedia.org/wiki/Adams'_catalyst

   The first published preparation was reported by V. Voorhees and Roger Adams. [2] The procedure involves first preparing a platinum nitrate which is then heated to expel nitrogen oxides. [3] H 2 PtCl 6 + 6 NaNO 3 → Pt(NO 3) 4 + 6 NaCl (aq) + 2 HNO 3 Pt(NO 3) 4 → PtO 2 + 4 NO 2 + O 2. The resulting brown cake is washed with water to free it ...

9. Canadian Platinum Maple Leaf - Wikipedia

   en.wikipedia.org/wiki/Canadian_Platinum_Maple_Leaf

   The platinum coins were made of .9995 pure platinum [7] in four denominations of different sizes, consisting of 1 troy ounce (oz), 1 ⁄ 2 oz, 1 ⁄ 4 oz and 1 ⁄ 10 oz. bearing the face values of $50, $20, $10, and $5, respectively. [3] [6] Their actual value, however, is determined by the daily market price of platinum. [5]