General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

porcelain/ copper

Dimensions

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

Length

5.4 cm

Width

3.7 cm

Height

1.3 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Energy-electric

Category

User site

Sub-Category

N/A

Manufacturer

AKA

Dorman

Country

England

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Unknown

Period

1890s+

Canada

An example of a fuse 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

A safety device which protects lamps and other electrical devices from over-voltage.

Technical

By 1896 all receptacle fuses had suffered from the defect that they had some exposed metal and were not safe to handle when alive. This problem was likely realized years before because in 1893 a patent for an insulated handle was issued. There were also a number of designs on the market before 1900 by Dorman-Smith Ltd., which were a great advance over much contemporary practice but which do not appear to have been patented. One of these was the "factory damper", which, although it had been in production for a number of years before the Home Office Regulations of 1908 were introduced, was found to comply with these stringent requirements and its manufacture was continued unaltered for many more years.

Area Notes

Unknown

Details

Markings

incised lettering on metal reads "PATENT/ I No 35:/ 3/ AMP"/ raised lettering on porcelain reads "D&S. PAT"/ 26420/98"

Missing

appears complete

Finish

glazed white porcelain body/ gold coloured metal

Decoration

N/A