DAIRY PKUUL'CT*	2()7
cylindrical for at	9 mm below the lowest and above the
highest graduation  marks.    The graduations represent
per cents, halves and tenths of a per cent.
2. Fifty-per cent_t 9-gram, 6-/w. Crcattt TV.y/ Bottlt.—The total
per cent graduation is 50.   The total height of the bottle is loO
tt
30   r

fig. 48.—Test bottles for fat in (a) cream, (6t milk and (c) skim-milk.
to 165 mm. The capacity of the bulb up to the junction with the
neck is not less than 45 cc. The graduated portion of the neck
has a length of not less than 63.5 mm and the neck Is cylindrical
for at least 9 mm below the lowest and above the highest gradua-
tion marks. The graduations represent five per cents, whole
per cents and halves of a per cent.
3. Fifty-per cent, 9-gram, 9~z'w. Cream Test Bottle.—Same as
(2) except that the total height of the bottle Is 210 to 225 mm.
Certain forms of test bottles are illustrated in Fig. 48.