The American annual of photography . advantages of the plate do notcompensate for the additional weight and bulk, and the diffi-culty of loading plate-holders while traveling; and this isdoubtless true for many—perhaps a majority—of the expos-ures that the tourist makes. Most of the incidents of travelcan be conveniently and satisfactorily recorded on films. But 189 there are always some special scenes which we long to pre-serve, in print or enlargement, at their very best: a bit of landor water, an historic corner, some gem of architecture; forthese, plates should be used. If color values are
The American annual of photography . advantages of the plate do notcompensate for the additional weight and bulk, and the diffi-culty of loading plate-holders while traveling; and this isdoubtless true for many—perhaps a majority—of the expos-ures that the tourist makes. Most of the incidents of travelcan be conveniently and satisfactorily recorded on films. But 189 there are always some special scenes which we long to pre-serve, in print or enlargement, at their very best: a bit of landor water, an historic corner, some gem of architecture; forthese, plates should be used. If color values are involved, andthey usually are, orthochromatic plates are needed. For the unusual picture, then, which is worth some troubleto secure, plate and film should be compared solely with refer-ence to their photographic qualities. The greater sensitivenessof the plate is usually, though not always, an advantage. If,as a matter of convenience, the tourist limits his supply ofplates to a single brand, they should be orthochromatic, and. then the advantage of the plate disappears, for the color-sensi-tizing dyes reduce the general sensitiveness of the plate, some-times considerably. This is shown in the accompanying figure,where A, B and C are prints from plates exposed to a steadylight for exactly equal intervals under a photographic wedge,and developed simultaneously in the same tray. The wedgeitself is a strip of plate of gradually increasing opacity fromone end to the other, and the length of the image thus gives ameasure of the sensitiveness of the plate tested. A is the rec-prd on a rapid orthochromatic plate, B ort a similar double^ T90 coated plate, and C on a film. It will be seen that in generalsensitiveness there is little to choose between them, thoughall are inferior to the ordinary, , non-orthochromaticplate. The non-halation quality of the film shows to advantagehere. The bright edges of A show considerable fog by hala-tion, while C shows practically none. B shows
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorktennantandw
