Accession No

5197

Brief Description

battery hypotester, 2/2 20th C

Origin

Maker

Class

physics

Earliest Date

1950

Latest Date

1998

Inscription Date

Material

glass; paper; organic (pitch)

Dimensions

length 110mm; maximum diameter 14mm

Special Collection

Provenance

Donated by Anglia Polytechnic University (now Anglia Ruskin University), East Road, Cambridge, on 07/01/1998.

Inscription

Description Notes

Glass barrel narrowing to long neck above. Base of barrel contains pitch. Inside the tubular neck is the measuring scale on paper. Scale divided 1400 - 1100, numbered by 50, subdivided to 10. Corresponding levels of charge are shown by coloured bands: green marks ‘full charge’ between 1350 and 1250; yellow marks ‘half charge’ between 1250 and 1150; red marks ‘dead battery’ between 1150 and 1100. Temperature at which hypotester should be used is given as 15˚C or 60˚F. The object is for testing the charge on a battery by placing the hypotester in the battery liquid. Works on the principle of the differences in specific gravity between water and hypo solutions.

Condition good; complete.

References

Events