Airplanes - Instruments - The developer of this type of instrument in the U.S. Mr. T.K. Peters making final adjustments on an instrument. Prior to the was this type of instrument was not manufactured in the U.S. and the Aero Instrument Corp. of New York City of which Mr. Peters is the founder is the firm now making the French type of instrument in this country. There are at present only four concerns manufacturing allimeters here, including the Aero, the other firms manufacturing the English type exclusively