VOLUME
2 1, N O . 1 0 , O C T O B E R
1949
31 A
IMPORTANT PROGRESS IN THE DEVELOPMENT OF ASH-FREE ANALYTICAL FILTER-AID FOR USE IN QUANTITATIVE ANALYSIS is represented by the new S&S N o . 289 D R Y - D I S P E R S E D ash-free filter pulp Produced from the finest ash-free raw material possessing about 9 7 % alpha cellulose indicating a virtual absence of degraded
cellulose, it eliminates the trouble
macerating tablets or strips of pulp.
required in
W e sincerely believe
that from every angle S&S No. 2 8 9 filter pulp represents the ULTIMATE product in the line of ash-free filter-aids.
One
gram of S&S No. 2 8 9 contains less than 0.1 milligram of ash. Ask for Bulletin No. 68 and for sample
CARL
SCHLEICHER & SCHUELL Co.
HEADQUARTERS FOR FINE ANALYTICAL FILTER PAPERS SINCE 1 8 5 6 · AN AMERICAN I N S T I T U T I O N SINCE 1 9 2 3
Plant and Laboratories: Executive and Sales Offices:
SOUTH LEE, MASSACHUSETTS
11 6 - 1 1 8 WEST 14th Street
·
NEW YORK 1 1 , Ν. Υ.
•r-·
CEHCO HVUHC OIL
'I
Specially Processed - Depend able for High Vacuum Pumps Cenco-Hyvac Oil is specially processed to assure maximum vacuum pumping speed at low pressure when using Cenco and other mechanical vacuum pumps. This oil is the result of exhaustive tests made in the Cenco laboratories on the hysical properties of a wide variety of vacuum pump oils. Ê)ata taken from tests show an increase in pumping speed of more than 10% over that obtained from the former CencoHyvac Oil, and as much as 3 5 % over that obtained from 'other oils tested. Obtain maximum pumping speed at low pressures in CencoHypervac 20, Cenco-Megavac, Cenco-Hyvac and other vacuum pumps by using Cenco-Hyvac Oil.
«>n5S-
J8m
No. 93050B C e n c o - H y v a c Oil i n quart glass bottle Each $ .60 No. 93050C Cenco-Hyvac Oil i n gallon ^ can Each $2.00
CENTRAL
SCIENTIFIC
Scientific 1700
NEW YORK
"ES? Λ
BOSTON
. .
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COMPANY
AfifiGA
