VOLUME 25, NO. 11, NOVEMBER 1953
31 A
TO OBTAIN DIRECT RATIO SPECTRAL T R A N S M I S S I O N MEASUREMENTS OR RECORDINGS
Comparator
with cover
removed
Announcing THE
FARRAND
. M _—*,.
HORNIG RATIO COMPARATOR Designed for Attachment to any Spectrometric Equipment
The Farrand Hornig Ratio C o m p a r a t o r p r o v i d e s a m e a n s of d e t e r m i n i n g directly t h e s p e c t r a l t r a n s m i s s i o n curve of a
features :
s u b s t a n c e r e l a t i v e to t h a t of a s t a n d a r d .
OPTICAL AND MECHANICAL ARRANGEMENT PER
M a x i m u m f r e e d o m of c h o i c e of s a m p l e s i z e a n d s a m p l e
LARGE SAMPLE CELLS, FILTERS, POLARIZERS, ETC.
MITS FLEXIBILITY IN THE USE OF SMALL AND v o l u m e is m a i n t a i n e d w i t h t h e o b j e c t of m a k i n g the s y s t e m a v a i l a b l e for u s e w i t h a n y d e s i r e d d i s p e r s i n g m e a n s . The C o m p a r a t o r a n d a s s o c i a t e d electrical n e t w o r k s p r o v i d e t h e g e n e r a l m e a n s of d e t e r m i n a t i o n of the ratio of light flux in t w o b e a m s .
• ERRORS IN RATIO CAUSED BY FREQUENCY CHAR ACTERISTICS OF DETECTORS, TRANSFORMERS OR AMPLIFIERS ARE ELIMINATED.
• ENERGY IN COMPARISON BEAM KEPT CONSTANT
The i n s t r u m e n t c a n b e u s e d i n d e p e n d e n t l y or l i n k e d to
Monochromators,
Spectrometers,
AT ANY PREDETERMINED LEVEL.
Spectrophotometers
P h o t o m e t e r s , etc. for ratio m e a s u r e m e n t s in t h e ultra-violet, visible
or
infrared
regions
p r o v i d i n g the a u x i l i a r y e q u i p
ENGINEERING RESEARCH DEVELOPMENT DESIGN and MANUFACTURE of PRECISION OPTICS, ELECTRONIC AND SCIENTIFIC INSTRUMENTS
m e n t or a c c e s s o r i e s a r e suit a b l y a d a p t e d for t h e c h o s e n function.
For further send
for
Bulletin
information Farrand No.
812
FARRAND OPTICAL CO. INC. BRONX BOULEVARD & EAST 2 3 8 t h STREET, NEW YORK 7 0 , Ν. Υ.
