General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

porcelain shell/ brass

Dimensions

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

Length

N/A

Width

N/A

Height

3.0 cm

Thickness

N/A

Weight

N/A

Diameter

4.7 cm

Volume

N/A

Lexicon

Group

Energy-electric

Category

User site

Sub-Category

N/A

Manufacturer

AKA

Sperryn

Country

Unknown

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Unknown

Period

early 20th century

Canada

An example of a ceiling rosette of a type used in Canada. Part of a large and varied collection of over 7500 electrical items acquired and documented by Ontario Hydro in the1960s. The collection was thought to be the largest and most comprehensive of its kind in Canada and was donated to the National Museum of Science and Technology in 1992.

Function

An electrical wiring device used to provide a means of connecting electrical wires coming from the wiring system of a building into a single wire or cable and also to provide a decorative cover from which this wire can emerge.

Technical

An example of a porcelain ceiling rosette of the early 20th century. According to Mellanby (Ref. 2) , a disadvantage of the usual design of rosette with a screwed cover was that after it was covered with several coats of whitewash, it was practically impossible to unscrew it to replace the flex. This fault was not present in the one-piece or conduit rose, first introduced by Dorman and Smith Ltd. in the early 1900s for direct attachment to circular conduit boxes.

Area Notes

Unknown

Details

Markings

raised lettering on underside reads "SPERRYNWOOD" and "REG. No. 384235"

Missing

appears complete

Finish

glazed white porcelain/ black screws

Decoration

N/A