artefacts: 216
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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 216 | 1966.0190.001 | Vacuum tube | GLASS/ METAL/ BAKELITE/ CARDSTOCK | RAC3 | MYERS E.B. CO. LTD. | Canada | Québec | Montréal | 1920 | 1928 | circa | CANADA: 299 182; 229 183; 229 184 | 1 | ONE BLACK CAP AND ONE WINE CAP/ UNCOLOURED GLASS/ BEIGE BOX WITH RED & BLACK PRINTING | THIS TUBE TYPE WAS ORIGINALLY MADE IN THE US IN JERSEY CITY NJ BUT AS IT INFRINGED OTHER THREE ELEMENT TUBE PATENTS SPECIAL PATENTS WERE TAKEN OUT BY MYERS IN CANADA AND MANUFACTURE OF THIS TUBE CEASED IN THE US | USED TO DETECT AMPLIFY OR OSCILLATE RADIO WAVES IN A RADIO RECEIVER | WIDE SEPARATION OF THE GRID AND ANONDE LEADS TENDED TO PROVIDE LOW DIRECT CAPITANCE WHICH MADE THE TUBE USABLE AT HIGHER FREQ. THAN SINGLE-ENDED TUBES | Vacuum Tubes | Receiving | Triode | glass->;metal->;synthetic->bakelite;paper | 8.7 | 1.9 | http://source.techno-science.ca/artifacts-artefacts/images/1966.0190.001.aa.cs.png | http://source.techno-science.ca/artifacts-artefacts/images/1966.0190.001.aa.cs.thumb.png |
