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|          Abbreviation           |                                    Explanation                                     |
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| AUTOMATIC COMPUTING             | Computations are done by machine                                                   |
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| BILLIONS ALGORITHM              | Algorithm developed by Billions (1965)                                             |
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| CORRECTED ALGORITHM             | An earlier algorithm has been corrected.                                           |
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| EVALUATOR                       | A specially designed mechanical device, often                                      |
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| GRAPH                           | A specially designed graph is used.                                                |
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| MANUALLY COMPUTED               | Humidity computations are made by hand.                                            |
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| MISC. ALGORITHM                 | Miscellaneous algorithm.                                                           |
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| NOMOGRAM                        | A specially designed graph and ruler are used.                                     |
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| PSYCHROMETRIC TABLE             | Numerical tables are used.                                                         |
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| SLIDE RULE                      | A specially designed slide rule is used.                                           |
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