Accession No

0265

Brief Description

‘Pickworth’s power computer for gas and oil engines’, by C.N. Pickworth, 1/2 20th C

Origin

Manchester; England

Maker

Pickworth. C.N.

Class

calculating

Earliest Date

1900

Latest Date

1950

Inscription Date

Material

paper (card); hide (leather)

Dimensions

length 164mm; breadth 61mm case length 178mm; breadth 74mm

Special Collection

Provenance

This item was allocated its number in 02/1976.

Inscription

‘PICKWORTH’S POWER COMPUTER FOR GAS AND OIL ENGINES
C.N. Pickworth. Wh. Sc. Manchester COPYRIGHT—EntdD. Stationers’ Hall’ (obverse)

Description Notes

Card slide rule for calculating power for gas and oil engines. Upper part of stock has scale for brake horse power and indicated horse power, divided 4 - 400, numbered 4, 5...10, 12, 15, 20...40, 50...100, 120, 150, 200, 250 300, 400. First slide has efficiency scale divided 30 - 100, numbered by 10. Also scale of firing strokes per minute and revolutions per minute, divided 8 - 800, numbered 8, 10...20, 25, 30, 40...80, 100, 120, 150, 200...400, 500...800. Second slide has scale for radius of brake wheel or effective length of lever, divided 2 inches - 16 feet. Also scale marked ‘mean effective pressure’ and ‘net weight or pull at end of lever - lbs’, divided 8 - 800, numbered 8, 10...20, 25, 30, 40...80, 100, 120, 150, 200, 250...400, 500...800. Lower part of stock has scale for ‘cylinder diameter’, divided 4 - 40, numbered 4, 5...16, 18...40.
Reverse plain.
Set of instructions on card.
Card slip case covered in leather.

Condition good; complete.

References

Events