. Bulletin. Science. Figure 6.—Staite's arc-light regulator of 1853. In tliis modification of his invention Staite used the upward buoyancy of the float {bb) to balance the downward pull of the coil of the solenoid {D). From J. Dredge, Electric Illumination, London, (about 1882), vol. I, p. 389. and irregular in its action.^ However, this regulator seemed so promising that after Archereau demon- strated it in a St. Petersburg square Czar Nicholas requested the Russian Academy of Sciences to in- vestigate streetlighting by this method.^" Then, in 1855, Archereau sought to illuminate t
. Bulletin. Science. Figure 6.—Staite's arc-light regulator of 1853. In tliis modification of his invention Staite used the upward buoyancy of the float {bb) to balance the downward pull of the coil of the solenoid {D). From J. Dredge, Electric Illumination, London, (about 1882), vol. I, p. 389. and irregular in its action.^ However, this regulator seemed so promising that after Archereau demon- strated it in a St. Petersburg square Czar Nicholas requested the Russian Academy of Sciences to in- vestigate streetlighting by this method.^" Then, in 1855, Archereau sought to illuminate the port of Marseilles with his arc ; In 1850 Duboscq simplified Foucault's regulator to the extent that it became sufficiently reliable for regular use in the theater as well as for laboratory and lecture demonstrations (figs. 11, 12). The use of the brilliant arc light became so necessary for spec- tacular effects that finally, in 1855, an entire rootn at the Paris Opera House was set aside for Duboscq's electrical equipment. The prizes at the Exposition Universelle of Paris in 1855 were handed out in the brilliance of this regulator, with one of the awards going to Duboscq for his invention; other prizes and honors followed successive improvements in the reg- ulator.'- However, the regulator was still too delicate, and there was a disadvantage in that the clockwork required winding. Except for Staite's lamp, these early regulators were satisfactory only for a relatively short period of 9 British patent 7924 (February 12, 1849); Du Moncel, op. cit. (footnote 5). ^0 Illustrated London News, December 1, 1849, vol. 15, p. 362. 11 Les Mondes, 1863, vol. 2, p. 452. 12 Jules Duboscq, "Note sur un regulateur electrique," Comptes rendits, 1850, vol. 31, pp. 807-809; Edmond Becquerel, "Rapport ... sur I'appareil photo-electrique de M. Jules Duboscq, opticien," Bulletin de la Societe d'Encouragement pour I'Industrie Nationale, 1855, ser. 2, vol. 2, pp. 45
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