. FOR DRY WINES THE APPARATUS SHALL BE GRADUATED FROM 0 * 9830 TO 1 * 0030 WITH GRADUATION MARKS EVERY 0 * 0010 AND 0 * 0002 . EACH MARK AT 0 * 0010 SHALL BE SEPARATED BY AT LEAST 5 MM FROM THE NEXT CORRESPONDING MARK . FOR THE MEASUREMENT OF THE SPECIFIC GRAVITY OF DE-ALCOHOLIZED WINES , SWEET WINES AND MUSTS , A SET OF FIVE HYDROMETERS GRADUATED FROM 1 * 0000 TO 1 * 0300 , 1 * 0300 TO 1 * 0600 , 1 * 0600 TO 1 * 0900 , 1 * 0900 TO 1 * 1200 AND 1 * 1200 TO 1 * 1500 SHALL BE USED . THESE HYDROMETERS SHALL BE GRADUATED IN DENSITIES AT 20 C WITH MARKS AT 0 * 0010 AND 0 * 0005 , EACH MARK AT 0 * 0010 BEING SEPARATED BY AT LEAST 3 MM FROM THE NEXT CORRESPONDING MARK .
THESE HYDROMETERS SHALL BE GRADUATED SO AS TO BE READ AT THE " TOP OF THE MENISCUS " . TO AVOID ANY CONFUSION WITH HYDROMETERS GRADUATED AT 15 C AND NORMALLY READ AT THE LIQUID SURFACE , AN INDICATION OF THE GRADUATION IN DENSITY AT 20 C AND OF THE READING AT THE " TOP OF THE MENISCUS " SHALL BE CARRIED EITHER ON THE GRADUATED SCALE OR ON A STRIP OF PAPER ENCLOSED IN THE BULB .
THESE HYDROMETERS SHALL BE CALIBRATED BY A GOVERNMENT DEPARTMENT .
THE RESULT SHALL BE EXPRESSED TO FOUR DECIMAL PLACES TO THE NEAREST THREE UNITS OF THE FOURTH DECIMAL PLACE ( MORE OR LESS 0 * 0003 ) .
A CALIBRATED THERMOMETER GRADUATED IN MINIMUM STEPS OF 0 * 5 C SHALL BE USED .
DETERMINATION OF DENSITY _ PROCEDURE
POUR 250 ML OF WINE INTO A LEVEL GLASS CYLINDER OF 36 MM INTERNAL DIAMETER AND 320 MM HEIGHT . PLACE A HYDROMETER AND THERMOMETER IN THE CYLINDER .
READ THE OBSERVED TEMPERATURE T C ONE MINUTE AFTER MIXING THE SAMPLE WELL . REMOVE THE THERMOMETER AND READ THE APPARENT DENSITY FROM THE HYDROMETER AFTER A FURTHER MINUTE .
THE DENSITY AT 20 C IS THEN CALCULATED USING TABLE V , VI OR VII ( 1 ) .
CORRECT THE DENSITY FOR THE EFFECT OF ADDED SULPHUR DIOXIDE AND OTHER PRESERVATIVES IN THE SAME MANNER AS DESCRIBED FOR THE REFERENCE METHOD .
( 1 ) IN THESE TABLES THE CORRECTION C IS GIVEN TO TWO DECIMAL PLACES TO ENABLE IT TO BE USABLE IF THE DENSITY WERE TO BE MEASURED WITH A PYCNOMETER OF ORDINARY GLASS .
FOR MEASUREMENT BY HYDROMETER , THE CORRECTION C SHALL BE EXPRESSED BY A SINGLE DECIMAL .
TABLE V
TEMPERATURE CORRECTIONS C TO THE DENSITY OF DRY WINES AND OF DRY WINES FREED OF ALCOHOL MEASURED WITH A HYDROMETER OR A PYCNOMETER OF ORDINARY GLASS AT T C TO RELATE THE RESULT TO 20 C ( SEE O.J . )
TABLE VI
TEMPERATURE CORRECTIONS C TO THE DENSITY OF NATURAL MUSTS AND