| LeapSecond.com :: Museum of Time & Frequency |
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| General Radio 1190A Quartz Bar |
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Several early General Radio high-stability frequency references used a quartz bar resonator inside a thermostatically controlled high-temperature oven. Below are some photos of the amazing GR 1190-A 100 kc quartz bar.
| A black aluminum rectangular box about 3 inches long |
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| A first peak at the inside |
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| The suspended gold plated quartz bar in all its glory |
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| Close view of gold wire leads |
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| Other end of gold wire spot welded to slab |
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| View of etched gold bridge |
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| View of nylon thread and spring mounts and non-contact end plates |
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| For scale, a 9V battery with disassembled GR 1190A crystal |
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| 1933 patent 2,029,358 describes the "electromechanical vibrator" |
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