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- Written by: David Richards *
- Category: Electronics
- Hits: 75
This Quartz crystal was bought from a collector who was told it had been cut for some electrical equipment, I lresearched what the posible application was for such a big crystal but cam to the conclusion that it is a man made synthetic quartz crystal in its raw form. Close inspection shows the mounting metal fasteners on the ends of the seed quartz. The shape is not in the same axis as a naturally formed crystal - the seed is cut on one of the minor axis', i.e it is grown on its side.
Here is a small natural crystal, and a diagram showing quartz planes and surfaces in the crystals.
Here is a link to a commercial synthetic quartz crystal growers web site https://www.ndk.com/en/products/crystal/glossary/
A document describing the manufacturing process: https://www.ndk.com/catalog/AN-SQC_GG_e.pdf
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- Written by: David Richards *
- Category: Electronics
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Historical Telephone Numbers
Rillington & surrounds
Gleaned from numbers found in old advertisements
| J. W. Jackson | Rillington 214 |
| J. W. Coates | Rillington 225 |
| H. S. Fox | Rillington 230 |
| N. Huddleston | Rillington 235 |
| J. Drake | Rillington 237 |
| H. Yates & Sons | Rillington 242 (night 379) |
| J. F. Bateson | Rillington 243 |
| T. Brignall & Son | Rillington 257 |
| F & H Calam, | Rillington 261 |
| J. Bramworth | Rillington 262 |
| A. Heseltine | Rillington 266 |
| R. Atkinson | Rillington 287 |
| J. O. & D. E. Love | Rillington 324 |
| Post Office, Scampston | Rillington 335 |
| S. Weighell | Rillington 355 & 356 |
| F. Turner, | Rillington 387 |
| W. W. Kilby, | Rillington 389 |
| H. C. Brignall | Wintringham 9Y1 |
| Harry Yates, | Wintringham 1 |
| Spaven Bros. | West Heslerton 252 |
| A. Bowes & Son | West Heslerton 246 |
Demonstration numbers
| 900 | Playback output |
| 901 | Playback output 901 |
| 902 | Playback output 902 |
| 903 | Playback output 903 |
| 904 | Playback output 904 |
| 9000 | Playback hello world |
| 101 | PJSIP/802a1fx1 |
| 102 | PJSIP/802a1fx2 |
| 618 | glasstty 6502 |
| 918 | glasstty 6510 |
| 201 | IAX2/iaxy-1 |
| 202 | IAX2/iaxy-2 |
| 123 | Speaking clock |
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- Written by: David Richards *
- Category: Electronics
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{up media-plyr=video | code=https://signpost.djrm.net/images/data/SonicInvadersDemo.mp4 | poster=https://signpost.djrm.net/images/data/IMG_20241020_161005843_HDR.jpg}
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- Written by: David Richards *
- Category: Electronics
- Hits: 895
Integrands S-100 CP/M Computer
{up markdown=images/articles/S100-Computer/S100-Boards.md}
