Fresnel Lens Orders, Sizes, Weights, Quantities and Costs
Below is a chart identifying the Fresnel Orders with their accompanying measurements, weights, number built, and costs
| FRESNEL LENS Sizes, Quantities, and Costs | |||||||||
| Number in U.S. | |||||||||
| ORDER | Radius mm | Radius inches | Height inches | Weight in Pounds | Number Built | 1900 | 1922 | 1945 | Cost |
| Hyper-Radial* | 1330 mm. | 52.3 inches | 148 inches | 18485 | 29 | 1 | 1 | 1 | $27,000 |
| Meso-Radial* | 1125 mm. | 44.2 inches | 126 inches | 15636 | 2 | 0 | 0 | 0 | $14,500 |
| First-Order | 920 mm. | 36.2 inches | 101.97 inches | 12787 | 467 | 57 | 57 | 42 | $12,500 |
| Second-Order | 700 mm. | 27.6 inches | 81.46 inches | 3527 | 261 | 27 | 26 | 25 | $8,000 |
| Third-Order | 500 mm. | 19.7 inches | 62.05 inches | 1984 | 384 | 65 | 65 | 68 | $3,800 |
| Three 1/2 - Order* | 375 mm. | 14.7 inches | 42.9 inches | 1200 | 25 | 25 | 25 | 20 | $2,000 |
| Fourth-Order | 250 mm. | 9.8 inches | 28.43 inches | 441 to 661 | 889 | 350 | 350 | 266 | $1,250 |
| Fifth-Order | 187.5 mm. | 7.4 inches | 21.3 inches | 265 to 441 | 580 | 146 | 129 | 65 | $950 |
| Sixth-Order | 150 mm. | 5.9 inches | 17.05 inches | 65 to 220 | 635 | 89 | 65 | 17 | $450 |
| Seventh-Order* | 140mm. - 100mm. | 5.7 - 4.1 inches | 6.5 inches | 15 | 54 | 0 | 0 | 0 | $350 |
| Eighth-Order* | 75 mm. - 70mm. | 3.1 - 2.9 inches | 3.25 inches | 6 | ? | 0 | 0 | 0 | $300 |
| 3326 | 760 | 718 | 504 | ||||||
| * These sizes were developed in the late 1800s and were extensions to Fresnel's design. | |||||||||
| The seventh and eighth-order lenses were used almost exclusively in Scotland and Canada, similar size lenses were known as a 'Steamer Lens' in America. |
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| The radius measurements are from the focal point of the lens to the inner lens surface. | |||||||||
| The number built were obtained from the Findlay Report for 1900. The number in the US is the higher of the number of each size reported by the Coast Guard as being in place in 1922 or the actual count from 1900. |
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| The numbers for 1922 and 1945 are from the USCG Manual for 1945. | |||||||||
| The numbers of pole lights and lens lanterns are not included. | |||||||||
| The cost is estimated based on the reported cost in 1900 and from BBT and is shown in 1900 dollars. | |||||||||
