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Darke's Steam Engine Indicator, by Elliott Brothers, London, 19th Century

Inventory Number 12968

Acknowledgement: © History of Science Museum, University of Oxford, inv.12968

Item type
Object
Provenance
Presented by the Marconi Corporation in 2003.
Primary inscriptions
'ELLIOTT BROS / LONDON'
Other inscriptions
Wooden box, paper lable inside lid 'IMPROVED PATENT STEAM-ENGINE INDICATOR. / MANUFACTURED BY / ELLIOTT BROTHERS, OPTICIANS, 449, STRAND, LONDON.' Wooden box, paper label inside lid'DARKE'S PARALLEL MOTION. / The Slides should be kept perfectly / clean and free from oil.' Small wooden ruler '20 TO THE INCH' / 'No 3D' / 'ELLIOTT BROS / LONDON'
Object type
Electronic instrument
Dimensions
Height: 90mm Width: 186mm Depth: 172mm Weight: 2.15kg
Inventory No
12968
Accession Number
2003-11

Description

Elliotts were at 449 Strand 1863-86."Darke's Steam Engine Indicator, by Elliott Brothers. The instrument is made of metal and comes in two parts, there is also two wooden rulers, three metal coils and one spanner housed in a wooden box with brass handle. The device records how the pressures in the cylinders of steam and internal-combustion engines change during the operating cycle.

12968.1 - Wooden Box with baize lined supports and compartments for each section of the Steam Engine Indicator.

12968.2 - Large metal Valve, 2 columns partially inline with each other and a single piece of string attached.

12968.3 - Small metal valve, with rectangular wooden handle.

12968.4 - Small wooden Ruler, with '20 to the inch' written on face of ruler.

12969.5 - Larger wooden Ruler, with '30 to the inch' written on the face of the ruler.

12968.6 - Metal open ended spanner

12968.7 - Metal Coil with 1/128 inscribed on top of coil.

12968.8 - Metal Coil with 125 15 on top of coil.

12968.9 - Metal Coil with 1/20 on top of coil. "

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