A. I. E. E. standards, no. 33, electrical measuring instruments now available

A new section of the A. I. E. E. Standards, No. 33, Electrical Measuring Instruments is now available in final approved form. It was adopted by the Board of Directors, December 10,1926 and is to become effective April 1, 1927. The standards in this section apply to the following kinds of indicating electrical instruments for direct and alternating current: Ammeters; voltmeters; wattmeters; reactive volt-ampere meters; frequency meters; power-factor, reactive factor and phase-angle meters; synchroscopes.