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用微量滴定管,可在10～15分钟内测定出微量(10～15毫克)矿物比重,精度达±0.01克/厘米~3。测定装置如下: 将双筒镜(MC—2型)平放。把内径2毫米的滴定管固定在装有锯齿螺丝的支架上。管的上端做成漏斗状(由此加入矿物),下端做成元锥状(聚乙烯塞子插入其中)。双筒镜的放大倍数,目镜以8×或2×,物镜以4×最适宜。在滴定管上,取10～15毫米(或略大)的高度为工作区向。选定目镜放大倍数后,在管上标出目镜—测微刻度(以厘米~3为单位)。为此,切几段10毫米长、直径0.5毫米的铜电线,在分析天上平分别称重(P),据电解铜的比重(8.945毫克/毫米~3),计算出每截铜线的体积V。
With microtiter burettes, trace (10-15 mg) mineral specific gravity can be determined within 10-15 minutes with an accuracy of ± 0.01 g / cm3. The measuring device is as follows: Lay the binocular (MC-2 type) flat. Burettes with a 2 mm inner diameter are mounted on a bracket with serrated screws. The upper end of the tube is funnel-shaped (thereby adding mineral) and the lower end is made in the shape of a cone (polyethylene plug is inserted therein). Binocular magnification, eyepiece to 8 × or 2 ×, the objective lens to 4 × the most appropriate. In the burette, take 10 ~ 15 mm (or slightly larger) height for the work area to. After selecting the eyepiece magnification, eyepiece - micrometer (in cm ~ 3) is marked on the tube. To do this, cut a few paragraphs 10 mm long, 0.5 mm diameter copper wire, respectively, in the analysis of the sky were weighed separately (P), according to the proportion of electrolytic copper (8.945 mg / mm ~ 3), calculated per copper wire volume V.