| CHINESECALENDAR | It was developed during the Eastern Zhou dynasty's Spring and Autumn period |
| LOSALAMOS | US town where the atomic bomb was developed during World War II (3,6) |
| INEPT | During early autumn period, going topless is foolish (5) |
| NOVELLA | Book jazz singer to appear after autumn period |
| RENOVATE | Do up judge's clothing close to late autumn period |
| SWALLOW | Bird with a forked tail that catches insects on the wing and spends the winter in tropical Africa, thousands can be seen in the skies over Mallorca during its spring and autumn migratory passage (7) |
| LORAN | Radio-based navigation system developed during the Second World War that was derived from the princi |
| GEORGIAN | Description of the style of architecture which developed during the reigns of the four Hanoverian kings of Great Britain (8) |
| PRESTEL | Brand name for the Post Office's Viewdata technology developed during the late 1970s |
| GENTIANA | Genus of flowering plants, the most famous of which are bright blue, at their best in spring and autumn (8) |
| EQUINOX | Horse's tail pulled by bull in spring and autumn? (7) |
| FLINT | Form of quartz used by humans to make stone tools for at least two million years which further developed during the Mesolithic period with microliths (5) |
| STEN | --- gun, a light 9mm sub-machine-gun formerly used in the British Army, developed during the Second World War (4) |
| NISSENHUT | Prefabricated type of building originally developed during the First World War to house troops (6,3) |
| SAKER | Medium cannon developed during the early 16th Century (5) |
| NOCTURNAL | Remarkable curl Anton developed during the night (9) |
| ICBM | Long-range weapon developed during the Cold War (initials) (4) |
| SARIN | A lethal nerve gas developed during the World War II (5) |
| SUMMER | Season between spring and autumn (6) |
| BOUNDARIES | Limits spring and autumn star sign (10) |
