EditorialInstruments monitor temperature and airflow at 4,600 feet below the surface at the Resolution copper-mine project near Superior, Ariz., Jan. 19, 2023. (Tamir Kalifa/The New York Times)
EditorialHerman Martinez, center, works out in San Antonio, Texas, on Thursday, July 16, 2020, at OSO CrossFit, a gym that features open bay doors, industrial fans to maintain airflow, and social distance instruction. (Christopher Lee/The New York Times)
EditorialA diagram of the arrangement of a restaurant’s tables and air conditioning airflow at site of an outbreak of coronavirus in Guangzhou, China. Red circles indicate the seating of future case-patients; the yellow-filled red circle indicates the index case, or first-documented, patient. (Centers for Disease Control and Prevention via The New York Times)
EditorialModel of a Double Pair or Hydraulic Forge Bellows, Model of a double hydraulic bellows on a floorboard. It consists of two vessels and a drive mechanism that is incomplete. Each vessel has a cylinder inside that connects top and bottom, the space insid...
EditorialModel of a Pair of Hydraulic Forge Bellows, Model of a hydraulic bellows on a floorboard. It consists of a barrel that is hung horizontally in two forks and can be turned a quarter circle around its axis by means of a lever. The space inside is transfo...