| ROBERTHOOKE | English scientist (1635-1703) who formulated the law of elasticity ('As the extension, so the force') in 1660 (6,5) |
| MANPOWER | So, the force of workers is sexist... seemingly? (8) |
| HOOKE | English polymath who formulated the law of elasticity, developed the balance spring, built the first Gregorian telescope and coined the word "cell"(5) |
| ROBERT | Forename of either the polymath discoverer of the law of elasticity, the inventor of the Bunsen burner or the Royal Society co-founder regarded as the first modern chemist (6) |
| ISAACNEWTON | English philosopher and mathematician (1642-1727) who formulated the law of gravitation: 2 wds. |
| PROUST | Joseph Louis -; analytical chemist who formulated the law of definite proportions (6) |
| RENEWAL | The extension of the period of a loan of a library book or the validity of a contract, lease, licence, subscription etc (7) |
| NEWTON | Sir Isaac who formulated the law of universal gravitation |
| ISAAC | Newton who formulated the law of universal gravitation |
| KEPLER | Astronomer who formulated the laws of orbital motion |
| SUFFRAGIST | An advocate of the extension of the right to vote, especially to women (10) |
| CHARTISM | British movement for the extension of political power to the workers (8) |
| TOE | One of the extensions from the front part of a foot (3) |
| VANDYCK | Anthony ___, who painted the famous triple portrait of Charles I (1635/36) (3,4) |
| SPRING | Device whose expansion and compression is described in Robert Hooke's law of elasticity, or, a season associated with house cleaning and decluttering rituals (6) |
| LINCOLNDOUGLAS | Twosome that debated the extension of slavery on the campaign trail |
| SUFFRAGETTE | Advocate of the extension of franchise to women (11) |
| HANOVER | From 1635 until it was dissolved in 1918, this Germanic royal dynasty provided many of Europe's monarchs; the House of ... |
| FREESOIL | Political party formed in 1848 that opposed the extension of slavery |
| JARDINDESPLANTES | The oldest botanical garden in Paris, originally created in 1635 by Louis XIII's physicians to house the royal medicinal herb garden (6,3,7) |
