| P number: | P528135 |
|---|---|
| Caption: | Muscovite mica cut, trimmed, split and graded as 'No. 3', 'stained' from the Loch Nevis Mica Prospect, Knoydart, Invernessshire. |
| Description: | Three specimens of muscovite mica cut, trimmed and graded as 'No. 3', 'stained' from the Loch Nevis Mica Prospect, Knoydart, Invernessshire and processed at the Pitlochry Sorting Factory. Grade No. 3 refers to a surface area of 10-15 square inches. British Geological Survey Petrology Collection sample number MC 7743. Out of seven categories of clarity, 'stained' is second poorest. These specimens at grade No. 3 are regarded as one of the larger sizes and hence used for special purposes only. Sheet mica had many uses during the Second World War when this specimen was mined and processed. It was used almost exclusively in the electrical industry as a dielectric. It was used for separating copper bars of commutators and for commutator rings; for electrical heating units; for disc, washers, bushings etc. in all types of electrical power and lighting equipment. |
| Date taken: | 25/06/1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 209.76 KB; 1000 x 665 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
Loading...
Loading...
Reviews
There is currently no feedback