The Scientific American journal's transition from a weekly to a full-fledged monthly came to be on 20 October 1921 when the November 1921 issue appeared. The illustrated spark is a detail from the October 15 cover — the final weekly. A big camera graces the October 8 issue, but for sheer loveliness I have to pick the October 1 fire-control platform of a ship as seen from the Brooklyn bridge.