- The following directions must be observed in packing brass and glass hydrometers :I.-Brass hydrometers-(a)in the cases 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 of 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, shavings, sawdust or other suitable elastic packing;(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 II.II.-Glass hydrometers-Each stem should be packed in a separate cylindrical tin case whose diameter is about one inch greater than the width of the hydrometer's bulb; and at least one inch longer than the hydrometer stem-(a)the tin case should first have some cotton, wool placed in it to a depth of one inch;(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 tightly, allowing equal distance all round between the bulb and case;(d)the case should then be filled with sawdust to within half an inch of the top. The remaining half inch 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.III. The tin case should then be packed in a wooden box large enough to allow each casing have a good layer of sawdust to separate it-(a)from neighbouring tins; and(b)from the sides and ends of the box.IV. The thermometer should be packed in the same manner.
