| Collection | ABDNP University of Aberdeen, Natural Philosophy Collection of Historical Scientific Instruments |
| Object Name | friction wheels |
| Object Number | ABDNP:200205a |
| Other Number | 205; C74 |
| Other Number Type | old number; collection number |
| Brief Description | Device exhibiting a low friction bearing. Friction wheels on circular base with holes for pulley cord - (top of Atwood's machine). Pulley wheel diameter 164 mm; small wheel diameter 100 mm; height from base 220 mm Steel axles. Glass cover with brass knob and base cover not perfectly circular fitting groove only one way round. Three 2 mm brass stud feet. Displayed in King's visitors' centre until 1993 - 2003. "Brilliant workmanship in the 1780s by the hand of Professor Copland himself. He created this model of a low friction bearing used as part of Atwood's machine."
Storage glass cover is dome ABDNP200518a |
| Dimensions | overall height 250 mm; wooden base diameter 295 mm |
| Materials | wood, brass, glass, steel |
| Condition | very good |
| Completeness | complete |
| Maker | Professor Patrick Copland |
| Object Production Place | Aberdeen |
| Object Production Date | 1780-1800 |
| Object History Note | 1823 inventory |
| Publication Note | LEMUR database |