Newton-Derby Operation & Maintenance Instructions for Automatic Carbon Pile Voltage Regulators Types A & A2. Dated 1953. Contains two large sections, 'Newton-Derby' Automatic Carbon Pile Voltage Regulators & 'Newton-Derby' Combined Voltage Regulator & Cut-Out. First section is broken down into 13 subsections. Second section is broken down into 3 subsections. Manual is an original.