the EDITOR'S \ column * L.T. Hallett, Editor
r p w o years ago we stated : " W i t h i n the past few weeks, three major instrument manufacturers have independently announced development of a 'poor m a n ' s ' infrared spectrophotometer. After conversations with instrument makers and analytical chemists, t h e editors feel t h a t this development, together with generally rapid progress in t h e field of infrared spectrophotometry, is significant. "One i m p o r t a n t aspect is t h a t these new instruments should free the spectroscopist from t h e necessity of using large infrared instruments for routine analyses. These instruments will m a k e it possible for the organic chemist to run m a n y of his own analyses, calling on t h e spectroscopist primarily for guidance in preparing samples a n d interpreting results. These instruments should also help bring infrared within t h e budgets of universities for both research and teaching." [Significance of N e w L o w Cost Infrared Spectrophotometers, ANAL.
CHEM.
29, 19A
(February
1957).] A recent survey b y P e r k i n - E l m e r Corp., one of t h e three instrument makers which developed such an instrument, indicates t h a t this prediction was correct. Sales are increasing steadily, a substantial number of organic chemists are using them, and laboratories which had no prior experience with infrared instrumentation have acquired them. P - E ' s survey results are based on information obtained from 150 representative purchasers of its lowcost instrument, called t h e "Infracord" double-beam infrared spectrophotometer. Results show t h a t over half of the 550 instruments sold during the p a s t 18 months ha\ f e gone t o laboratories with no prior infrared instrumentation. While t h e chemical industry
WeJcJi SPARKLESS ELECTRIC STIRRER with INDUCTION TYPE MOTOR Non-Sparking—Speed Controlled —Long Wearing
Provides maximum safety Watt-Type Governor Stabilizes Speed
Speed Adjustable from 200 to 1400 Revolutions Per Minute—
$54.75
Thrust Ball Bearings Insure Long Life, 'Continuous Running
No. 5230
5230A. ELECTRIC STIRRER, Sparkless, for 230 Volts, A.C. Consists of No. 5230 Stirrer equipped with a step-down transformer to permit operation on 230 volts 50 or 60 cycles A C . Each $64.50
5230. ELECTRIC STIRRER, Sparkless. Complete with 6-foot connecting cord, line switch and plug. For operation on 50 or 60 cycles, 115 volts A.C. Each $54.75
W. M. WELCH SCIENTIFIC COMPANY DIVISION OF WELCH MANUFACTURING COMPANY
ESTABLISHED 18 8 0 1515 SEDGWICK STREET, DEPT. A - 1 , C H I C A G O 10, ILLINOIS, U.S.A. Manufacturers of Scientific Instruments and Laboratory Apparatus
H E V I - D U T Y High-Temperature COMBUSTION TUBE FURNACES Temperatures to 2600° F. Hevi-Duty High-Temperature T u b e Furnaces are complete, compact units, designed for applications requiring temperatures from 1700° F. to 2600° F. A tap-changing transformer, plus all controls and instruments necessary for operation, is housed in the pyramid base. Easily replaceable Silicon Carbide heating elements a r r a n g e d above and below the heating chamber and multiple zone temperature control provide uniform heat. Two input selection switches offer 48 steps of temperature control for each heating zone. Fast heat-up and low power consumption are provided through efficient designs. Write for Bulletin 254 for complete
details.
CHAMBER LENGTH
M A X . TUBE SIZE
ZONES OF T E M P . CONTROL
G-02712-PT
12"
2" O.D.
1
2 3 0 - 6 0 cycle
250
G-02720-PT
20"
2" O.D.
2
2 3 0 - 6 0 cycle
410
1,045.00
G-5727*
27"
5" O . D .
3
2 3 0 - 6 0 cycle
1,880
2,695.00
TYPE
*Floor-mounted. 36-step transformer
HEVI&DUTY ELECTRIC CO.
VOLTS
SHIPPING WEIGHT
PRICE $
630.00
located in furnace stand. Control instruments separate.
• LABORATORY
FURNACES TRADE
MULTIPLE UNIT MARK • ELECTRIC
Milwaukee 1 , Wisconsin:
EXCLUSIVE
Circle No. 53 on Readers' Service Card VOL. 3 1 , N O . 2 , FEBRUARY 1 9 5 9 ·
87 A
