General Information

Serial #

N/A

Part Number

1

Total Parts

2

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

An early example of a fluorescent bulb. The Preheat model was an early type of fluorescent lamp. Cathodes had to be pre-heated to electron emitting temperature before the lamp would light. This lamp required the use of a separate starter which supplied several seconds of current flow through the cathodes to pre-heat them between the time the tube was turned on and the time the lamp emitted light.

Area Notes

Unknown

Details

Markings

Black lettering on glass reads 'F40 CW CANADA/ COOL WHITE SYLVANIA/ RAPID START-PREHEAT'

Missing

Appears complete

Finish

White tube/ metallic and black end caps

Decoration

N/A