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KLETT PRODUCTS
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Klett. COLONY MARKER AND TALLY. For the rapid and accurate counting of colonies. Marks and records at the same time, leaving permanent record for rechecking. When all of the colonies in an area or dish have been marked, the tally is read and then is reset to zero with the reset knob. Plates that would be considered too crowded for counting by the usual method can be counted easily with this instrument. The counting operation can be interrupted at any point without causing errors. Complete with pen and extension cord. For operation on 115 volt, A.C., 60 cycle.
KLETT BIO-COLORIMETER
The visual colorimeter illustrated presents a number of outstanding features making it ideal for c l i n i c a l o r r e search work. Built on the most modern mechanical and optical principles it is widely accepted for accuracy and durability.
Klett MANUFACTURING CO., INC.
179 E A S T 87th S T R E E T , N E W Y O R K , Ν . Υ.
Circle No. 10 on Readers' Service Card
( - 0 - C H a - ) | M . W = 170-0837
(~CH2 — CH = C H j )
ISO I 6 0 170 ΙΘΟ
Analysis by Mass The latest addition to the ΑΕΙ range of mass spectrometers is the MS 9 - a double focusing, high resolution instrument specially designed for the examination of organic compounds. The mass spectrum can be used to give structural information as well as the molecular weight of an organic compound. Under electron bombardment, molecules break down in a characteristic mannerand correlation of spectra w i th known structures enables a 're-assembly' of the fragments into a structural formula. Another important advantage of the MS 9 is that only small samples need be used, often less than a microgram. We wou ld like to tell you more about this equipment, so please wri te for leaflet. The mode of operation is shown in a colour film entitled 'Analysis by Mass' wh ich is available on free loan.
M S 9 M A S S SPECTROMETER
iL ue^T-^oe^-t-e-
In the USA, technical literature on ΑΕΙ Mass Spectrometers is available from; NUCLEAR AND ANALYTICAL DIVISION, PICKER X-RAY CORPORATION, WHITE PLAINS, NEW YORK, USA, Elsewhere write to ΑΕΙ INSTRUMENTATION DIVISION, SCIENTIFIC APPARATUS DEPARTMENT, BARTON DOCK ROAD, URMSTON, MANCHESTER, ENGLAND
— C — 0 - C H a - C H 1 - C H = C H 2 ΑΕΙ
Circle No. 166 on Readers' Service Card
Associated Electrical Industries Limited I ns t rumenta t ion Division
s /s 318
VOL. 36, NO. 9, AUGUST 1964 · 1 1 7 A