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We initiated digitization of the Moscow collection of astronomical platesusing flatbed scanners. Techniques of photographic photometry of the digitalimages were applied, enabling an effective search for new variable stars. Oursearch for new variables among 140000 stars in the 10 x 5 degrees northern halfof the field centered at 66 Oph, photographed with the Sternberg Institute's40-cm astrograph in 1976--1995, gave 274 new discoveries, among them: 2probable Population II Cepheids; 81 eclipsing variables; 5 high-amplitude DeltaScuti stars (HADSs); 82 RR Lyr stars; 62 red irregular variables and 41 redsemiregular stars; 1 slow irregular variable not red in color. Light elementswere determined for periodic variable stars. We detected about 30 variabilitysuspects for follow-up CCD observations, confirmed 11 stars from the NewCatalogue of Suspected Variable Stars, and derived new light elements for 2stars already contained in the General Catalogue of Variable Stars.

New Variable Stars on Digitized Moscow Collection Plates. Field 66 Ophiuchi (Northern Half)