| FEATURES |
EXAMPLES |
PERIOD OF COMMON USE |
| LENS
design |
| Round lenses |
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pre-1730 - 1820 |
| Visual glasses (Martin's Margins) |
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early 1760's - 1820 |
| Oval lenses |
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around 1790 - 1900 |
| Four lenses (Richardson) |
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1815 - 1900 (most found are octagonal 1860s) |
| Rectangular and Oblong lenses |
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1835 - 1890 |
| Octagonal lenses |
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1835 - 1880 |
| BRIDGE design
|
| "C" bridge |
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pre 1750 - 1840 |
| "K" and "X" bridge |
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1810? - 1900 |
"Crank" bridge - upside down "U" in the U.S.
"Arch" bridge in the U.K. |
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after 1835 - 1880 |
| scroll bridge |
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1870? - 1900 |
| "W" bridge (saddle) |
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1885 - after 1900 |
| TEMPLE design
(Side arms)
|
| Short wide temple with large ring finials (earliest
examples had Scarlett spirals) |
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1720s - 1840? (possibly as early as 1714)
|
| Double hinge (Ayscough) |
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1760 - 1820 |
| Turn-pin style (pivot) |
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1800? - 1900 |
| Pin-in-slot (wide-telescopic) |
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1815 - 1860 (narrowing during this period) |
| Long straight |
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1850 - 1900 |
Loop slide (narrow telescopic) - in the U.S.
"figure of eight" in the U.K. |
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1840 - 1890 |
| Curl temples (riding bow) |
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1885 - after 1900 |
| TEMPLE Finials (endings) |
There
are many variations of temple finials |
| Large rings |
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1740 - 1810 |
| Small rings |
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1810 - 1830 (only seen on wide telescopic) |
| Teardrop loops |
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1790 - 1900 (generally grew smaller during this period) |
|
Interesting Variations |
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Amber colored shooter's lenses |

Decorated brass temple spectacles with frosted lenses |

Skull fit |
Unknown |
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