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(1)将大号试管(23×200毫米)下端,用喷灯火焰烧灼至软并拉长,冷却后截去封口部分,在火焰下作成比重管(附图)。如无大号试管,可用非蛋白氮消化管代替,虽因共玻璃质硬,制备比较困难,但便于应用;还可用血糖管代替,只将其球部锯掉或烧灼其球部再迅速插入冷水中即可制成,不过血糖管内径较细,比重计容易粘附在管壁上。(2)将青霉素瓶塞剪成中空及四周四个半圆形缺口,置于比重管内。(3)在比重管的下端,连一内径为5毫米,长为5～10厘米或更长一些的橡皮管,并附带一个橡皮管夹。(4)用直径2～2.5毫米、长50厘米左右的鉄丝,一端作成环状紧套在比重管的颈部,另一端固定在水池上的渗水架上或适当位
(1) The large test tube (23 × 200 mm) lower end, with a torch flame burning soft and elongated, cut off after cooling part of the seal, in the flame made of gravity pipe (with photos). If no large test tube, non-protein nitrogen digestion tube can be replaced, although due to a total of glassy hard, preparation is more difficult, but easy to use; can also be replaced by blood glucose tubes, only the ball sawed off or burning its ball and then quickly inserted Cold water can be made, but blood glucose tube diameter smaller, easy to adhere to the hydrometer tube wall. (2) The penicillin cork cut into four hollow and four semicircular gap, placed in the proportion of tube. (3) At the lower end of the proportion pipe, a rubber hose with an inner diameter of 5 mm and a length of 5 to 10 cm or longer is attached with a rubber hose clamp. (4) with a diameter of 2 to 2.5 mm, about 50 cm long reed, one end made of ring-shaped tight sets in the neck of the proportion pipe, the other end fixed in the water seepage on the basin or the appropriate bit