The radiant time series (RTS) method is a new method, derived directly fiom the heat balance method, for performing. design cooling load calculations. It effectively replaces all other. simplified (non-heat-balance) methods such as the cooling load.
The last wheat pennies were made in 1958. They were produced from 1909 to 1958. They are generally common and worth a few cents above face value and can be found in pocket chaâ¦nge.
Today, pennies are made from copper-coated zinc. But in 1942, the U.S. Government halted the minting of copper-coated bronze coins â switching to steel instead â because copper was needed to manufacture ammunition during World War II. A few of these bronze pennies made it out, however. The pennies remain the most famous and valuable of all wrong-metal issues.