OSRAM SPECTRAL SOURCES FOR INVESTIGATION OF FLAME FLUORESCENCE using the techniques of Dr. Winefordner
as reported in this issue
This justly famous series of gas discharge lamps can be used in a wide variety of applications requiring monochromatic radiation. Detailed specifications are given in the accompanying table. The glass or quartz tube containing the gas vapor or metal whose spectrum is desired is sealed in a bulb that provides thermal insulation and mechanical protection. The material of the envelope depends on the particular spectral region; it is either ordinary glass or a special glass which transmits light down to a wavelength of 2,800 A. Lamp 26-229 has a special window in the outer envelope which transmits radiation down to 2,300 A. All lamps are 6% inches high overall, with an outside diameter of 1 Ά inches, and they emit their maxi mum intensity of radiation from the same space within the tube. The lamps take the special socket and conical base 26-250. The support rod is 1 cm in diameter and may be removed from the conical base so that the socket may be used on optical benches or with special supports. The lamp must be used at all times with the base down. These lamps have a starting potential of 220 volts a.c. and must be used with a series resistance or choke coil such as 26-255. The lamps must not be con nected direct to 220 volts a.c. lines. The light intensity of these lamps is very constant. With the exception of the neon and helium lamps, it takes several minutes before full intensity is reached.
Complete
range
of 12 lamps
2 6 - 2 5 0 ADJUSTABLE SOCKET WITH BASE A N D UGHTSHIELD FOR OSRAM SPECTRAL LAMPS
Osram Spectral Lamp on 26-250
This socket is needed to operate the Osram Spectral Lamps. It has 1 cm diameter support rod and leads with knife plugs to connect to 26-255. It comes complete with a heavy conical base and a black metal lightshield. The socket is adjustable in the base for height and can be removed from the base for use on optical benches or in other holders. The lamp must always be used with the base down. (Illustrated with Osram Spectral Lamp).
Socket and Base
Price: $15.00 Specifications for O s r a m Spectral Lamps Catalog Number
Price
26-220 26-222 26-224 26-226
$28.25 28.75 25.75 28.25
26-228
29.75
Hg/Cd
26-229 26-230 26-232 26-236 26-238 26-240 26-242
30.75 28.25 28.25 25.75 28.25 28.25 28.25
Hgs Κ Να Ne Rb ΤΙ Zn
Symbol
Cd Cs He Hg
Kind
Cadmium Caesium Helium Mercury Mercury & Cadmium Mercury Potassium Sodium Neon Rubidium Thallium Zinc
* Transmits to 2800 angstroms.
Material Burner Envelope
Operating Operating Potential Current Amperes Volts
Surface Width mm
20 20 15 20
8 10 10 3
1.0 0.1 2.3 150
12 7 60 50
1.5 1 .5 1 .3 1.2
18 10 65 50
Quartz
Glass*
30
1.0
30
15
20
3
5.0
Quartz Glass Glass Glass Glass Quartz Quartz
Glassf Glass Glass Glass Glass Glass* Glass*
55 10 20 30 10 14 14
1 .1 1 .5 1.3 1 .5 1 .5 1.0 1 .5
50 14 22 40 13 13 20
50 0.15 30 3.5 0.4 0.8 1 .0
20 20 15 20 20 9 20
2 10 10 10 10 3 8
120 0.02 12 0.8 0.04 3.0 0.1
t This lamp has a window in the outer envelope to extend the range in the ultraviolet to 2300 angstroms and has a special burner of high constancy of light emission.
26-260 STEP-UP TRANSFORMER Can be used with 26-255. Primary voltage 110 volts a.c. Secondary voltage 220 volts a.c. Price: $87.50 ANALYTICAL CHEMISTRY
3.0 0.7 3.5 110.
.Surface Brightness Stilb
Emitting Height mm
Glass* Glass Glass Glass*
This choke coil is designed as a ballast for use with the Osram Spectral Lamps. The input voltage must be 220 volts a.c. There are 7 different connections pro vided marked for the particular lamp being used. Price: $65.00
·
Light Intensity Candela
Quartz Glass Glass Quartz
26-255 UNIVERSAL CHOKE COIL FOR OSRAM SPECTRAL LAMPS
44 A
Power Dissi pated in Lamp Watts
Order direct from:
THE
Ealing
CORPORATION
2 2 4 3 Massachusetts A v e n u e , Cambridge, M a s s . 0 2 1 4 0 Circle No. 17 an Readers' Service Card Circle No. 98 on Readers' Service Card
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