* » •
s it flP**. '
i*TO
HHHV*
«ïl
4
vj
SOLVENT PROOF STOPCOCKS NEED NO GREASE Because they never need grease, LabCrest stopcocks have solved some of the most annoying problems in modern lab work. I n infrared analysis, for example, Lab-Crest permits you to analyze the sample . . . not the sample plus stopcock grease. Blood cholesterol determinations can be run with LabCrest separatory funnels, eliminating tedious a n d inaccurate pipette transfers. " D r y " stopcock work is n o
longer necessary in chromatography and vitamin B, determinations. I n caustic service, Lab-Crest frees you from the daily lubrication grind. Lab-Crest Burettes have been used daily for u p to two years in I N N a O H without lubrication . . . without freezing. Y o u can throw your stopcock pullers away! And LabCrest's unique lock n u t eliminates any chance of a plug popping under a heavy column of sulfuric acid. T h e sure way to gain the advan-
tages of Lab-Crest stopcocks is to look for the Lab-Crest seal on burettes, separatory funnels, chromatography columns-wherever convenience, accuracy, a n d freedom from contamination a r e important. Write for your copy of new Catalog 80C100, Fischer & Porter Co., 1598County Line Road, Hatboro, Pa.
Lab-Crest
For further information, circle number 72 A on Readers' Service Card, page 101 A 72 A
·
ANALYTICAL CHEMISTRY
