Simple And Flexible Flask Supports for Weighings
A .:'..
.; ,;
B
Simple supports for round-bottom flasks can facilitate weighings or additions of reagents to the flasks. Such supports can easily be fabricated from three small pieces of heavywalled vacuum tubing (rubber or Tygon) held in place on a short length of wire by crimping or twisting. For example, 1 cm lengths of tubing ( 2 3 cm o.d.1 can conveniently be cut (with diagonal cutters, tin snips or aviation shears). One piece of the tubing is held
-
a t the the or adiameter length centerofof of coat aflask piece hanger). toofbeheavy supported, Thewire length (e.g., and of heavy wire may used begauge -10-25 depends A1 or cm. Cu, on If
soft A1 or Cu wire is used, the tubing can conveniently be held in Two suggested variations for flask SuPPoflsmade from place by twisting the wire; with coat hanger wire, crimping with relatively rigid "coat-hanger"wire (A) O r from soft Al Or pliers is satisfadory The second and third lengths of tubing are Cu wire (6). similarly attached a t the ends of the wire, and the assembly is bent to about a 60' angle. (Figure A) If soft wire is used, the ends may be twisted together to provide a more robust support , a s shown in Figure B. Three advantages of these supports are their light weight, low fabrication costs, and flexibility to accommodate unusual apparatus sizes or shapes.
Robert Rothchild The City University of New York, John Jay College of Criminal Justice Department of Sciences, Toxicology, Research and Training Center 445 West 59th Street New York. NY 10019-1199
Volume 70 Number 5 May 1993
409
