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KLETT PRODUCTS > Λ ••*»*. Klett. COLONY MARKER AND TALLY. For the rapid and accurate counting of colonies. Marks and records at the same time, leaving per- manent 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 opera- tion can be interrupted at any point without caus- ing errors. Complete with pen and extension cord. For operation on 115 volt, A.C., 60 cycle. KLETT BIO-COLORIMETER The visual color- imeter illustrated presents a num- ber of outstand- ing features mak- ing it ideal for clinical or re- search work. Built on the most modern mechanical and op- tical principles it is widely accepted for accuracy and dur- ability. Klett MANUFACTURING CO., INC. 179 EAST 87th STREET, NEW YORK, Ν. Υ. Circle No. 10 on Readers' Service Card (-0-CH a -) |M.W= 170-0837 (~CH2 — CH = CHj) ISO I60 170 ΙΘΟ Analysis by Mass The latest addition to the ΑΕΙ range of mass spectro- meters 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 bom- bardment, molecules break down in a characteristic mannerand correlation of spectra with 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 would like to tell you more about this equipment, so please write for leaflet. The mode of operation is shown in a colour film entitled 'Analysis by Mass' which is available on free loan. MS 9 MASS 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-CH a -CH 1 -CH=CH 2 ΑΕΙ Circle No. 166 on Readers' Service Card Associated Electrical Industries Limited Instrumentation Division s/s 318 VOL. 36, NO. 9, AUGUST 1964 · 117 A

Klett MANUFACTURING CO., INC

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KLETT PRODUCTS

> Λ

• • * » * .

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