26 A
ANALYTICAL CHEMISTRY "It's the 'Work-Horse' of our laboratory. We h a v e a n u m b e r of analytical instruments, but it is the Model 14 that really carries our load. It's working all day, every day and it turns out more and better work than any other instrument we have."*
ANALYTICAL WORK-HORSE The Coleman Universal has always been known as a
tory; long-path cells for trace determinations; fluor-
" W o r k i n g Instrument" for it performs routine spectro-
escence attachments for vitamins or other fluorophors;
photometric measurements faster and easier than any
micro accessories f o r small sample quantities; an
other instrument made. Yet it has the
to
adapter for nephelometry; and measuring circuits of a
meet the special problems that arise in every labora-
precision not exceeded by any instrument of its kind.
flexibility
Here's why the COLEMAN is so convenient Use of a diffraction grating
The diffraction grating creates a true undistorted spectrum, unlike prisms whose spectrums a p p e a r condensed in the short wavelengths, much wider in the longer ones.
Allows using a fixed bandpass
The true spectrum used in the Universal, makes possible a fixed slit. The bandpass is 3 5 mu and it is constant at all wavelengths. Only Coleman Spectrophotometers fully select color with a single d i a l , a n d without seco n d a r y adjustment of the slit.
For easier operation and full reproducibility
The Coleman's fixed Band-pass allows valid use o f calibration curves, eliminates need for continual preparation and use of concurrent standards; insures reproducibility, simplifies and speeds instrument operations. N o vacuum tubes and no mechanical linkages means lower maintenance, greater reliability.
*Name on request.
For complete details write to: Coleman Instruments, Dept. A , 318 Madison St., Maywood, III.—Ask for Bulletin B-212
COLEMAN
UNIVERSAL SPECTROPHOTOMETER
