- The following directions must be observed in packing brass and glass hydrometers :-

I. Brass hydrometers -

(a) in the case of brass instruments with detachable weights, these should be wrapped up in tissue papers and made into a separate packet;

(b) a sufficient amount of cotton, wool or soft paper should be placed over the instrument in the case to prevent any risk or displacement in transit;

(c) the case should then be packed in a wooden or tin box. The space between this outer case and the instrument box should be sufficiently packed with paper, shaving, sawdust or other suitable elastic package;

(d) in the case of brass instruments, the packet containing the weights should be placed in the space between the outer and inner cases;

(e) the thermometer must be packed separately in a tin cylinder as described under

(a) the tin case should first have some cotton wool placed in it to a depth of 2.54 cm.

(b) the hydrometer should then be gently placed in the case, bulb uppermost (not pushed down through the cotton wool to the foot of the case);

(c) it should then be thoroughly packed round with dry sawdust, not rammed too rightly, allowing equal distance all round between the bulb and case;

(d) the case should then be filled with sawdust to within 1.27 cm of the top. The remaining 1.27 cm should be filled with cotton wool;

(e) the cap should then be put on without undue force and securely fastened. A loose cap should not be used.

(a) from neighboring tins; and

(b) from the sides and ends of the box.