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.
 
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.   
 
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.