Accession No

6168

Brief Description

clip-on ammeter, by Ferranti, English, mid-20th Century

Origin

England

Maker

Ferranti

Class

electrical

Earliest Date

1930

Latest Date

1970

Inscription Date

Material

plastic; glass; metal (stainless steel); rubber; leather

Dimensions

(in case): height 340mm; width 140mm; breadth 83mm

Special Collection

Provenance

Donated on or before 23/01/2003. The donor collected the instruments over many years, predominantly from private sales, some were obtained direct from the manufacturers who were going to throw them out.

Inscription

FERRANTI CLIP-ON AMMETER
50C/S MADE IN ENGLAND
No. 67124
TYPE A
AMPERES A.C.

Description Notes

Ammeter held in light brown leather case, with metal clip buckle on front, and leather strap.

Ammeter case is made of black plastic, and consists of a handle, above which is a semi-circular dial gradiated and marked with three seperate scales (0-25; 0-50; 0-100 Amperes, A.C.). Below the dial, on the underside of the circular base to the main body is a sliding switch, which can be moved to set the ammeter to 10; 25; 50; 100; 250; 500; and 1000.

Below and to the side of the dial is a trigger grip the enables the user, holding the handle, to move one of the arms of the large clip (above the main body) to seperate the clip so that it can be clipped onto an electrical circuit.

The other half of the metal clip is held stationary above the main body of the ammeter in an L shape. Both halves of the clip are sheathed in rubber.

References

Events