1911 ca. Hoyt Type 25 Voltmeters and Ammeters

1911 ca. Hoyt Type 25 Voltmeters and Ammeters 5″×9″ page 1 1
1911 ca. Hoyt Type 25 Voltmeters and Ammeters 5″×9″ page 3
1911 ca. Hoyt Type 25 Voltmeters and Ammeters 5″×9″ page 4
1911 ca. Hoyt Type 25 Voltmeters and Ammeters 5″×9″ page 2