Juergen Freund / Split level of solar powered gauge measuring sea temperature, West New Britain, Papua New Guinea, May 2010

Mike Read / Trinicellu train running along hillside on a metre gauge track, Corsica, France. May 2017.

Mike Read / The Trinicellu train running along a hillside on a metre gauge track in Corsica, France, May 2017

Constantinos Petrinos / Narrow gauge railway built by Evaristo de Chirico, Mount Pelion, Greece. March 2008.

Constantinos Petrinos / Narrow gauge railway built by Evaristo de Chirico, Mount Pelion, Greece. March 2008.

Christophe Courteau / Young girl checking a rain gauge in a garden. Brittany. France. Model released

Nick Upton / Narrow gauge railway locomotive hauling wagons loaded with dried peat turves, passing rows of newly cut turves. Goldenstedt moor, near Vechta, Lower Saxony, Germany.

Nick Upton / Narrow gauge railway wagons being loaded with dried peat turves. Goldenstedt moor, near Vechta, Lower Saxony, Germany.

LYNN M. STONE / Lady hunter with .12 gauge shotgun and black Labrador Retriever in autumn woodland, sitting on log; Putnam, Connecticut, USA. Model Released

Lewis Jefferies / Fisherman measuring European lobster (Homarus gammarus) with a gauge to check legal landing size. This one is undersize and will be returned to the sea, Falmouth, Cornwall, UK. March, 2023.

Paul Harcourt Davies / Old, rusting locomotive engine, taken over by nature on the old Peloponnese narrow gauge railway nr. Naupflion, Greece. March, 2015.

James Dunbar / Jewel wasp (Ampulex compressa) tasting the hemolymph from a American cockroach (Periplaneta americana) to gauge the amount of venom with which to sting the cockroach.