Lamp bulb, discharge

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OBJECT TYPE: fluorescent/tube/bipin/instant start
DATE: 1950
ARTIFACT NUMBER: 1992.3012.001

MANUFACTURER: Sylvania
MODEL: Cool White Standard Instant Start
LOCATION: Canada

More Information

General Information

Serial #: N/A
Part Number: 1
Total Parts: 1
AKA: N/A
Patents: N/A
General Description: Glass tube coated with white phosphor/ metal parts/ synthetic parts

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length: 121.0 cm
Width: N/A
Height: N/A
Thickness: N/A
Weight: N/A
Diameter: 3.8 cm
Volume: N/A

Lexicon

Group: Lighting Technology
Category: Lamp bulbs
Sub-Category: N/A

Manufacturer

AKA: Sylvania
Country: Canada
State/Province: Unknown
City: Unknown

Context

Country: North America
State/Province: Unknown
Period: circa 1950+
Canada: An example of a lamp bulb made and used in Canada, part of a large and varied collection of over 7500 electrical items acquired and documented by Ontario Hydro in the 1960s. The collection was thought to be the largest and most comprehensive of its kind in Canada and was donated to the Canada Science and Technology Museum in 1992
Function: A device used to provide illumination by means of an electric current which excites mercury vapour in a glass tube, producing short-wave ultraviolet light that then creates fluorescence, producing visible light.
Technical: Instant-start type bulbs required no starter switches, lowering the cost of maintenance. To allow for an instant start, the lamp bulb contained a loose overwind of fine (0.7 mil.) tungsten wire added to a coil of modified dimensions. The overwind performed a double function. First, it reduced sputtering time by rapidly reaching the emitting temperature when the arc first struck; and second, it acted as a 'basket' to hold a large quantity of emission material tightly. When the first lamps of this design were manufactured, they were affected by end discolouration. This problem was resolved in 1947 by using a cathode shield made of nickel or iron.
Area Notes: Unknown

Details

Markings: Black lettering on glass reads 'S [logo] SYLVANIA/ INSTANT START/ 40W COOL WHITE/ STANDARD/ MADE IN CANADA'
Missing: Appears complete
Finish: White tube/ black end caps with metallic pins
Decoration: N/A

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Sylvania, Lamp bulb, discharge, circa 1950, Artifact no. 1992.3012, Ingenium – Canada’s Museums of Science and Innovation, http://collections.ingeniumcanada.org/en/id/1992.3012.001/

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