Deprecated: Optional parameter $table declared before required parameter $keyAndValue is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezQueryInterface.php on line 367

Deprecated: Optional parameter $table declared before required parameter $keyAndValue is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezQueryInterface.php on line 381

Deprecated: Optional parameter $table declared before required parameter $keyAndValue is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezQueryInterface.php on line 389

Deprecated: Optional parameter $totable declared before required parameter $fromTable is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 500

Deprecated: Optional parameter $columns declared before required parameter $fromTable is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 500

Deprecated: Optional parameter $table declared before required parameter $keyValue is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 615

Deprecated: Optional parameter $table declared before required parameter $keyValue is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 622

Deprecated: Optional parameter $table declared before required parameter $keyValue is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 636

Warning: define(): Argument #3 ($case_insensitive) is ignored since declaration of case-insensitive constants is no longer supported in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 189

Warning: define(): Argument #3 ($case_insensitive) is ignored since declaration of case-insensitive constants is no longer supported in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 190

Warning: define(): Argument #3 ($case_insensitive) is ignored since declaration of case-insensitive constants is no longer supported in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 192

Warning: define(): Argument #3 ($case_insensitive) is ignored since declaration of case-insensitive constants is no longer supported in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 193

Warning: define(): Argument #3 ($case_insensitive) is ignored since declaration of case-insensitive constants is no longer supported in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 194

Warning: define(): Argument #3 ($case_insensitive) is ignored since declaration of case-insensitive constants is no longer supported in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 195

Warning: define(): Argument #3 ($case_insensitive) is ignored since declaration of case-insensitive constants is no longer supported in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 197

Warning: define(): Argument #3 ($case_insensitive) is ignored since declaration of case-insensitive constants is no longer supported in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezFunctions.php on line 198

Deprecated: Optional parameter $table declared before required parameter $keyAndValue is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezQuery.php on line 540

Deprecated: Optional parameter $table declared before required parameter $keyAndValue is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezQuery.php on line 596

Deprecated: Optional parameter $table declared before required parameter $keyAndValue is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezQuery.php on line 653

Deprecated: Optional parameter $table declared before required parameter $keyAndValue is implicitly treated as a required parameter in /var/www/clients/client17/web55/web/vintti/julkaisut/historiakone/includes/db/ezsql-3/shared/ezQuery.php on line 658
Hallatutkija :: 1823 :: :: Historiakone :: Julkaisut :: Agricola - Suomen historiaverkko

Hallatutkija

W. von Wrightin akvarelli. Kansallismuseo, kuva Museovirasto.

W. von Wrightin akvarelli. Kansallismuseo, kuva Museovirasto.

Gustaf Hällströmin kirjoitus Undersökning om vattnets volumförändring af värme, och bestämmelse af den värmegrad, hvarvid vattnets täthet är störst julkaistiin. Se sai Ruotsin Tiedeakatemialta sekä Fernerin että Lindblomin palkinnon.

Hällström osoitti oikeaksi De Lucin havainnon, että vedellä on suurin tiheys n. + 4 –¾ C lämpötilassa. Hän käytti kokeessa vaakakupin alla hiuksesta riippuvaa ohutseinäistä lasipalloa, joka upotettiin veteen ja jonka koko vaihteli lämpötilan mukaan. Kokeen tulos, so. että vedellä on suurin tiheys + 4,108 –¾ C lämpötilassa, on varsin tarkka.

Hällström oli suomalaisen hallatutkimuksen auktoriteetti. Vuonna 1804 hän sai Suomen talousseuran suuren palkinnon. Hänen teoriansa pohjalta ihmisiä pyrittiin neuvomaan hallan torjunnassa.