Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography (1899) (14781449132)

Identifier: livingpicturesth00hopw (find matches)
Title: Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography
Year: 1899 (1890s)
Authors: Hopwood, Henry V., 1866-1919
Subjects: Motion pictures
Publisher: London Optician & Photographic Trades Review
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto



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so obtained by him met with a ready sale whenprinted on bands appropriately slotted for use as aTachyscope (see page 25). Much of his success wasdue to the employment of an improved form of shutter,very similar to the present focal-plane pattern withadjustable opening. Not only were his photographsprepared in this manner for inspection, but in the year1889 he brought out his so-called Electrical Tachyscope^though there was no point of similarity between thisinstrumicnt and the Tachyscope proper. As will beseen by the illustration (Fig. 51), transparent photo-graphs were arranged in series round the margin of adisc contained in an inner room and revolved before anopening equal in area to one design. Both the inner E 50 LIVING FICTURES. chamber and that containing the audience weredarkened, and as each picture came behind the aperturea pin on the disc operated an electric current, thuscausing a spirally wound Geissler tube (placed at theback of the picture) to light-up momentarily, the
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Fig. 51. successive pictures being seen by the light of therepeated flashes. The disc-form of this apparatus wasexhibited in 1889, but in 1892 it was patented with theadditional suggestion that a strip of photographs mightbe used, a suggestion put in practice shortly afterwards CJIRONO-FHOTOQRAPHY. 51 by the introduction of coin-freed or penny-in-the-slotapparatus (called the Electric Wonder) for viewingliving pictures in this and other countries. This appearsto have been the first practical and public developmentof Desvignes suggestion, in i860, to use an electricspark to render each picture visible at its proper timeand place. Nevertheless, it must not be forgottenthat Donisthorpe, in 1876 and 1878, suggested his■so-called Kinesigraph, the feature of which was inter-mittent illumination of a series of views in strip formby similar means to those just described, while the same■expedient was one of the first adopted by Edison whenconducting the experiments which resulted in the we