- 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 underII. Glass hydrometers - Each stem should be packed in a separate cylindrical tin case whose diameter is aboue 2.54 cm greater than the width of the hydrometer bulb; and at least 2.54 cm longer than the hydrometer stem-(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.III. The tin case should then be packed in a wooden box large enough to allow each case having a good layer of sawdust to separate it -(a)from neighboring tins; and(b)from the sides and ends of the box.IV. The thermometer should be packed in the same manner.
