BS ISO 14548:2021 pdf download – Photography — Dimensions of glass plates

BS ISO 14548:2021 pdf download – Photography — Dimensions of glass plates This document specifies the nominal sizes of photographic glass plates, together with cutting dimensions and their tolerances. It also specifies the nominal substrate thicknesses and their tolerances, as well as providing a cross-reference for sheet films being used in newly manufactured holders for 19 th century glass plate cameras. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1, Geometrical product specifications (GPS) — Standard reference temperature for the specification of geometrical and dimensional properties ISO 554, Standard atmospheres for conditioning and/or testing — Specifications 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at https://www.electropedia.org/ 4 Conditions for measurement of dimensions 4.1 Dimensions The dimensions and tolerances specified in this document shall apply at the time of manufacture (except where specifically stated otherwise), when measured under atmospheric conditions of (23 ± 2) °C and (50 ± 5) % relative humidity, as specified in ISO 554. 4.2 Calibration of measuring instruments All measuring instrument calibrations shall be conducted at a temperature of 20 °C as specified in ISO 1,and a relative humidity of 50 %. 5 Dimensions 5.1 Cutting dimensions Cutting dimensions and tolerances of plates shall conform to the values given in Tables 1 and 2. 5.2 Substrate thickness Substrate thicknesses of glass plates shall conform to the values given in Table 3.BS ISO 14548 pdf download.