| Common Force Measure (Year of 1757) |
| 1 poundal (pdl.) | = | unit of force that gives a mass of 1 av.lb. acceleration of 1 ft./sec./sec. |
| 1 pdl. | = | 0.0310809 av.lb. |
| 1 pdl. | = | 0.138255 newton (N) |
| 1 pdl. | = | 0.0140981 kilgravre force |
| 1 pdl. | = | 13825.5 dyne |
| 1 pound force (lbf.) | = | 32.17405 pdl. |
| 1 lbf. | = | 4.44822 newton (N) |
| 1 lbf. | = | 0.453592 kilogravre-force |
| 1 lbf. | = | 444823 dyne |
| 1 slug or geepound | = | unit of mass acquiring acceleration of 1 ft./sec./sec. by a force of 1 av.lb. |
| 1 slug | = | 32.17405 av.lb. |
| LEATHER SEALER'S OFFICE, Londonderry, Vt. | April 8th 1826 | Rory Ely Cole |
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| Copyright © MMII Rory Ely Cole |