General Information

Serial #

DA 27674

Part Number

1

Total Parts

26

AKA

N/A

Patents

N/A

General Description

METAL CONSTRUCTION; FIBRE CORD

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

17.0 cm

Width

11.0 cm

Height

19.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Industrial Technology

Category

Power sources

Sub-Category

N/A

Manufacturer

AKA

Dobbie

Country

Scotland

State/Province

Unknown

City

Glasgow

Context

Country

North America

State/Province

Unknown

Period

THIS TYPE OF INDICATOR USED IN LATE 1800S +.

Canada

Unknown

Function

TO TEST EFFICIENCY OF VALVES IN STEAM ENGINES, AND TO DETERMINE HORSE POWER DEVELOPED DURING OPERATION.

Technical

EXAMPLE OF STEAM ENGINE INDICATOR, WHICH IS USED AS ARECORDING PRESSURE GAUGE. IT PLOTS STEAM PRESSURE AND PISTON DISPLACEMENT IN A RECIPROCATING STEAM ENGINE. THIS TYPE WAS RECOMMENDED FOR USE ON ORDINARY MARINE AND LAND STEAM ENGINES. THE EXTERNAL SPRING DESIGN ALLOWED THE SPRING TO REMAIN RELATIVELY COOL WHEN NOT IN USE, PRODUCED MORE ACCURATE RESULTS, AND PROLONGED THE LIFE OF THE SPRING.

Area Notes

Unknown

Details

Markings

"DOBBIE-MCINNES" incised on indicator. "PATT./ A" incised on black collar. "D.A./ 27674" incised in 2 areas. "sole makers DoBBIE MCINNES LIMITED GLASGOW" incised on lower edge. "DOBBIE MCINNES/ REG'D/ DOBBIE MCINES LTD./ GLASGOW" incised on top of chart housing. "4" incised on underside of stylus arm.

Missing

UNKNOWN; LACKS PAPER CHARTS

Finish

BRIGHT NICKEL PLATING

Decoration

N/A