Accession No

2008

Brief Description

Ewing's magnetic curve tracer, by Nalder Brothers and Company, English, 1902-1912 (c)

Origin

England; London

Maker

Nalder Brothers and Company

Class

magnetism; electrical

Earliest Date

1902

Latest Date

1912

Inscription Date

Material

stone (slate); metal (brass, iron); glass

Dimensions

length 780mm; breadth 275mm; height 224mm

Special Collection

Provenance

Transferred from Cavendish Laboratory, University of Cambridge, 1974. Listed in the Cavendish Numerical Catalogue: ‘Magnetic Curve Tracer from Eng. Lab. 1929’. Cavendish Laboratory Number: E 980

Inscription

‘EWING’S
MAGNETIC CURVE TRACER
NALDER BROS. & CO. LONDON
No. 4799’ (on brass plate on base)
‘E. 980’ (on base (added))

Description Notes

Rectangular slate base: one fixed and two adjustable feet; ten brass terminals; one electromagnet with fixed iron core and one consisting of two long solenoids with removable cores; two conducting wires, stretched so that they pass through the air gaps of the two electromagnets; brass weights on two hinged supports to provide tension for the two wires; small circular mirror. With (a)instruction booklet from Nalder Bros., (b) two printed copies of student instructions from the Cavendish Laboratory, and (c) three pages of handwritten notes, unsigned and undated, all in a Cambridge University Electrical Laboratory folder.

Condition: good (moving wires not in place); complete.

References

Events