Accession No

4043

Brief Description

Threlfall micromanometer, by Cambridge and Paul Instrument Company, English, 1920

Origin

England; Cambridge

Maker

Cambridge and Paul Instrument Company Ltd.

Class

medical

Earliest Date

1920

Latest Date

1920

Inscription Date

Material

metal; glass; plastic

Dimensions

main instrument length 260mm; breadth 240mm; height 180mm; one part length 170mm; breadth 103mm; depth 94mm

Special Collection

Cambridge Instrument Company Collection

Provenance

Donated by the Cambridge Instrument Company. Used at the Post-Graduate Medical School, Ducane Rd, London, pre 1963

Inscription

‘THE CAMBRIDGE AND PAUL
INSTRUMENT CO. LTD ENGLAND
No. C7984’ (top of metal chamber)

Description Notes

Threlfall micromanometer. The instrument is supported on a black-painted metal box with three levelling screws and a circular bubble level. There are two cylindrical chambers, one is totally sealed and made out of metal. The other is an open metal cylinder which was surrounded by a thick glass cylinder (only a small broken portion remains). This glass cylinder had a circular glass lid (broken) which supports a micrometer screw whose point (protected by a plastic tube) can be adjusted vertically. The vertical scale is calibrated in 0.5mm by the alignment of two scales each calibrated in 1m increments, and has a range of 50mm. Between the two chambers is a vertical support for the micrometer lid clamp. Both cylinders have outlet pipes with a brass cock which opens and closes both chambers simultaneously. Repair label attached which reads: Received Book No 16772 / Received 27 Nov. 1963 / From POST GRADUATE MEDICAL / SCHOOL, DUCANE RD, LONDON / W.12 / 1-THREFALL MANOMETER (ON LOAN) (ATT. MR. GOLDFINCH) / (ATT. MR. PALLETT.).

Condition

References

Events