I then examined the fittings of this mechanism, whose power was increased a hundredfold by biconvex lenses that were designed like those in a lighthouse and kept its rays productively focused. This electric lamp was so constructed as to yield its maximum illuminating power.
Ik beschouwde toen zeer nauwkeurig de inrichting van dit werktuig, welks werking vierhonderdvoudigd werd door ringvormige lenzen, die evenals de glazen op vuurtorens gesteld waren, en daardoor het licht in de vereischte richting deden schijnen.