. Bulletin. Science. Figure 29.—The first magneto generator designed bv Woolrich. It was constructed in 1844. Photos courtesy of Department of Science and Industry, City Museum and Art Gallery, Birmingham, Tyndall, Faraday's associate, could proudly write to the editor of the French scientific publication Cosmos that he was the first person to be informed by Faraday of a new application of electricity that "consists of an electric light which is truly splendid and which can be immediately employed for illuminating light- ; ^= Faraday's approval was the result of some
. Bulletin. Science. Figure 29.—The first magneto generator designed bv Woolrich. It was constructed in 1844. Photos courtesy of Department of Science and Industry, City Museum and Art Gallery, Birmingham, Tyndall, Faraday's associate, could proudly write to the editor of the French scientific publication Cosmos that he was the first person to be informed by Faraday of a new application of electricity that "consists of an electric light which is truly splendid and which can be immediately employed for illuminating light- ; ^= Faraday's approval was the result of some demon- strations that Holmes made for Faraday and the Trininty House Light Committee in March 1857 in the latter's experimental "lantern" at Blackwall, near London (fig. 34). It was agreed that a more extensive trial was to be made in a lighthouse, but that Holmes would have to redesign his equipment in order to meet the strict conditions imposed by the Elder Brethren. The machine used at Blackwall was based on Holmes' patent of the previous year. It had five banks of stationary electromagnets and six rotating disks mounted on a common arbor driven by a 2)^-hp. steam engine at 600 There were 6 compound inagnets per disk and 24 electromagnets per bank, and the generator was provided with a commutator. The machine was quite large, meas- uring 5 feet square and A)i feet high and weighing 2 tons.^'' As a result of the conditions imposed, it now had to be directly coupled to the steam engine, to run at a much lower speed, and to have a sufficiently low electrical output so that it would not be dangerous to the personnel using the equipment. It seeins quite ^^ Cosmos, 1857, vol. 10, pp. 535-536. Magazine, 1849, vol. 51, pp. 271-272. also Mechanics 3« F. H. Holmes, "On Magneto-Electricity, and its Applica- tion to Lighthouse Purposes," Journal of the Society of Arts, 1863, vol. 12, pp. 39-43; James N. Douglass, "The Electric Light Applied to Lightho
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Keywords: ., bookauthorunitedstatesdepto, bookcentury1900, booksubjectscience
