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Now! Chromatography without sample remixing . . . without contamination. Four different minimum-volume fittings, three exclusive construction fea- tures, 49 standard column sizes make Lab-Crest your most logical source for chromatography columns and fittings. Exclusive eluent regulator clamps dir- ectly on special column extender. Pro- vides precise control of input, elimi- nates need for make-shift reservoirs. All parts Teflon or glass: no contamination. Exclusive Teflon-sheathed O-ring seal ends corrosion, leaks, contamination. The O-ring provides a live, strong seal; the Teflon sheathing presents an inert surface to the eluent. Exclusive, highly precise all-Teflon needle valve never needs grease, never contaminates the sample. Reference scale aids resetting. Clamp-together con- struction for easy assembly, cleaning. Choice of Jour fittings (Nobody else gives you such a choice.) All have heavy walls to minimize sample volume, strengthen fittings, aid in sealing. Small vol- ume prevents re-mixing through sample "hang-up". (A) Threaded needle valve with glass tip. (B) Threaded needle valve with Teflon tip. (C) Lab-Crest stop-cock for on-off control. (D) Plain glass tip. There's more. 49 different column sizes. (Seven sizes, 5 to 50 mm I.D., in seven lengths from 150 to 1200 mm.) Plus extenders in lengths to suit. Water-jacketed columns and special columns built to your specifications are readily and quickly available. For details, including prices, ask for Catalog 80A270. A Complete Line of Laboratory and Scientific Glassware · Special Glass fabrication · Glass Process Pipe and Drainiine 1 0 8 A • ANALYTICAL CHEMISTRY FISCHER & PORTER COMPANY Lab-Crest ® SCIENTIFIC DIVISION Warminster, Pa. Phone 215-OS 5-6000 1F-4U9
