Perforated board mounting for semimicro set-ups

J. A. Beech Medicine University of Maryland Baltimore

school of

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Perforated Board Mounting for Semimicro set-UPS

Normal lalmmtory stands and clamps an. somewhat rr~mhersomrwhen used with semimicro glassware. Thr following mounting system is vwsat,ile and port,able, and allo\vs rapid setting-up. A perforat,ed ''g-in. romposition hoard, 21 in. on a sidr, is mounted on a frame as illust,rated in Figure I . 7'0 fix apparat,us to the hoard the mounting clip illnstrated in Figurr 2 was dc+yrd. The dip is 6 / 8 in., the

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I Figure 1 .

Mounting board ready for use

wooden cube 1 in. The bolt is inserted through a hole in the perforated hoard and a wing nut tightened onto it, from t,he ot,her side. A microburner resting on the base is usually an adequate heat source, hut if a heating mantle is required, a pegboard fit,ting (4-in. douhle straight armhooks) bent as in Figure 2 will hold it. I t will also hold a 150-ml beaker for anice, sand, or hot water bath. As the board has two sides, a long reaction requiring minimum attention can be set up on one side and after carefully turning it the other side can be used for shorter reart,ions. The port,ahilit,y of the board makes it possible t,oremove incomplete react,ions from the bench and complcte them lat,er. The hoard is also a convenient mount for demonstrations. which can be assembled elsewhere, brought in t,o accompany a lecture, and rapidly removed following the lect,ure. When part of t,he apparat,us is not in the vertical plane, the holes in the perforated board may not align rorrrct,lv. For added flexibilitv it is therefore advisahk to use ball joints, tor example with condensers. Standard joint 18/9 and standard taper 14/10 are reeommwded ~

Figure 2. Leff, clip to mount gloss opparotur heating mantle or 150-ml beaker.

Rignt, fllting to mount

Volume 39, Number 6 , June 1962

!293