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.
If your Lincoln Memorial penny has a date before 1982, it is made of 95% copper. If the date is 1983 or later, it is made of 97.5% zinc and plated with a thin copper coating. For pennies dated 1982, when both copper and zinc cents were made, the safest and best way to determine their composition is to weigh them. Solid copper pennies weigh 3.11 grams (+/- 0.130 g.), whereas the copper plated zinc pennies weigh only 2.5 grams (+/- 0.100 g.). Back in the early 1970s, the rising price of copper was pushing the cost to make a penny over its face value of one cent. Fortunately, the price of copper dropped and production continued.