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13 résultats pour : water conservation

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Dietikon; trees reflecting on water; marble pond; 1961
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Dietikon; trees reflecting on water; marble pond; ...

Safety-construction against seepage of fire water, 1986.
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Safety-construction against seepage of fire water,...

Heinz Odermatt opening a weir on the Reuss, Lucerne 1993
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Heinz Odermatt opening a weir on the Reuss, Lucern...

Inspection of water and gas pipes, 1972.
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Inspection of water and gas pipes, 1972.

Don't waste water circa 1941-1943.
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Don't waste water circa 1941-1943.

Don't be a drip! Be patriotic ... Stop leaks ... Save water circa 1941-1943.
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Don't be a drip! Be patriotic ... Stop leaks ... S...

No water - no guns Don't waste it!! circa 1941-1943.
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No water - no guns Don't waste it!! circa 1941-194...

Magic lantern slide circa 1900
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Magic lantern slide circa 1900

Magic lantern slide circa 1900
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Magic lantern slide circa 1900

Iron Age forge in Mafuga Forest. A forge used by forestry workers to harden the tips of rock drills
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Iron Age forge in Mafuga Forest. A forge used by f...

Adding lime to neutralise the water. District Forest Officer James Lang Brown (top) watches as two
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Adding lime to neutralise the water. District Fore...

Liming and testing the water. Conservator Alec Watt lies flat on the banks of a forest nursery
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Liming and testing the water. Conservator Alec Wat...

Testing the water at a forest nursery. Dressed in khaki uniforms and wellington boots, District
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Testing the water at a forest nursery. Dressed in ...