Bauhaus-Universität Weimar

Titel:
L. E. Knott Apparatus Company: Scientific Instruments, Catalogue 26
Person:
Knott, L. E.
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit13684/245/
240 
L. E. KNOTT APPARATUS COMPANY 
FILTER PAPERS 
HARCOURT FILTERS 
for 
Qualitative Work 
These filters are made from a pure white paper of exceptional quality, of tough texture and very rapid. This 
grade of paper is suggested for general use in the laboratory and for all qualitative work. 
5365 
HARCOURT FILTERS, round, 
a 
in boxes containing 100 filters. 
b c 
d 
e 
f 
Diameter, inches 3 
4 
5 
6 
8 
10 
Per box $0.17 
.21 
.25 
.34 
.65 
.75 
5366 
-, in sheets 19X19 inches. . . 
Per ream 12.00 
Arthur D. Little, Inc. 
DOUBLE ACID WASHED ASHLESS FILTER PAPER 
for 
General Quantitative Work 
This paper is an American product produced only after two years’ careful experimentation and research by one 
of the leading consulting organizations of the country — a concern with 35 years’ experience in the application of 
chemistry to industry. It is made by chemists for chemists in a building devoted exclusively to industrial chemistry. 
It is a paper made for General Quantitative Work and its combination of properties permits the elimination or 
many of the special purpose papers formerly required. It is superior to any American or foreign made paper for all¬ 
round laboratory work. 
This paper is “ ashless ” —it is washed with both hydrochloric and hydrofluoric acid and is made in the only 
mill in the world operating on distilled water. 
It retains Barium Sulphate and precipitates of equal fineness, but its close texture does not sacrifice speed of 
filtration. It is faster than any paper on the market with equal retention of filtrate and may be used for commercial 
work where time is important. This paper is stronger than any rapid quantitative filter on the market. Its great 
strength permits its use for ordinary Buchner funnel work and, except for “ crude fiber ” analyses, eliminates the 
necessity for a specially treated paper for this purpose. 
It is subjected to a system of rigid inspection and test that insures a high degree of uniformity. Each filter 
^inspected before a bright light before it is packed so that every circle can be used without hesitation. 
Cat. No. 5368 
Diameter of Circle, cms. 
Ash Content Per Circle, gram 
Per Sealed Box, 100 Circles 
a b c 
5.5 7 9 
.000015 .000024 .00004 
$1.10 1.20 1.70 
d e f 
11 12.5 15 
.00006 .00008 .00011 
2.00 2.30 2.70 
g 
18.5 
.00017 
3.60
        

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