Stoker’s lens by p. Roulet, c 1880
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A stoker lens with constant axis in case by p. Roulot opticien, circa 1870. P roulot has a factory, on the quai des orfevres, and a shop, on the bd hausmann both in paris. This system works with a variable power with a constant axis. This would make the measurement of astigmatism much simpler. Measurements case 17 x 7 x 2,5 cm
