artefacts: 61826
This data as json
| rowid | artifactNumber | ObjectName | GeneralDescription | model | SerialNumber | Manufacturer | ManuCountry | ManuProvince | ManuCity | BeginDate | EndDate | date_qualifier | patent | NumberOfComponents | ArtifactFinish | ContextCanada | ContextFunction | ContextTechnical | group1 | category1 | subcategory1 | group2 | category2 | subcategory2 | group3 | category3 | subcategory3 | material | Length | Width | Height | Thickness | Weight | Diameter | image | thumbnail | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 61826 | 1992.1776.001 | Engine dividing | CAST IRON/ STEEL/ BRASS/ SILVER | Brightly Charles H. | United States of America | Pennsylvania | Philadelphia | 1890 | 1 | TABLE EXCEPT TOP SURFACE PAINTED GREY. BRASS SURFACES LACQUERED | USED BY A CANADIAN FIRM IN THE MANUFACTURE OF SURVEYING INSTRUMENTS. THE FIRM THOMAS POCKLINGTON INSTRUMENTS CO. OF TORONTO BOUGHT THE DIVIDING ENGINE C.1939. IT WAS USED MOST HEAVILY DURING WWII. THE COMPANY WENT INTORECEIVERSHIP IN 1992 [REF.1]. | USED TO DIVIDE THE CIRCULAR SCALES OF SCIENTIFIC INSTRUMENTS SUCH AS OCTANTS SURVEYING INSTRUMENTS ETC. | A RELATIVELY RARE TYPE OF MACHINE- TO THE END OF THE 19C ONLY ABOUT 50 HAD BEEN MADE. PRECISION REQUIRED WAS 1 TO 40 000 INCH. UNTIL C.1880 DIVIDING ENGINES WERE THE MOST PRECISE MACHINE MADE. AT THAT TIME RELATED MACHINES USED TO EXECUTE SPECTROSCOPIC GRATINGS SURPASSED THIE PRECISION OF SCALE DIVIDING ENGINES [REF.1] | Metrology | Precision tools | Exploration and Survey | Instrument testing equipment | Miscellaneous | Industrial Technology | Tools-Machine | Tools | metal->iron;metal->steel;metal->brass;metal->silver | 160 | 120 | 93 | http://source.techno-science.ca/artifacts-artefacts/images/1992.1776.001.aa.cs.png | http://source.techno-science.ca/artifacts-artefacts/images/1992.1776.001.aa.cs.thumb.png |
