From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Four graphs showing performance curves for various dynamos under hot and cold conditions, measuring volts and amperes against speed.
| Identifier | ExFiles\Box 50\1\ Scan244 | |
| Date | 23th November 1920 | |
| DOCUMENT WIDE TEXT: Note. The Smith dynamos were converted to simple shunt machines by removing the control brushes and setting the main brushes in the exact neutral position. Note. The Rotax and U.S.A. Bosch dynamos were converted to simple shunt machines by removing the control brush and connecting the single field winding across the main brushes. GRAPH 1 (TOP LEFT): Header: COLD CONDITIONS Title: COLD VOLTS Y-Axis: E.M.F. (VOLTS) X-Axis: DYNAMO SPEED (R.P.M.) Line Labels: Rotax (20/2), Bosch (Bosch), Rotax R.D. type (20/2), Smith 20 h.p. (S.C.), Rotax A12300. Cr.{Mr Cra???ster / Mr Chichester}, Scintilla-Bosch, Blumler, WESTINGHOUSE (U.S.) Horizontal Line Indicator: 12.6 volts Handwritten Annotations: H / 22-8-20, E.T.C. / 23/11/20 GRAPH 2 (TOP RIGHT): Roman Numeral: IV Header: HOT CONDITIONS Title: HOT VOLTS Y-Axis: E.M.F. (VOLTS) X-Axis: DYNAMO SPEED (R.P.M.) Line Labels: Rotax (20/2), Rotax R.D type (20/2), Scintilla Bosch (Fr.), U.S.A. Bosch (U.S.), Smith 20 h.p. (S.C.), Blumler (U.S.), Westinghouse (U.S.) Horizontal Line Indicator: 13.6 Volts Handwritten Annotations: A/L / 22-8-20, E.T.C. / 23/11/20 GRAPH 3 (BOTTOM LEFT): Header: AMPERE OUTPUT CURVES OF PLAIN SHUNT-WOUND DYNAMOS FOR COLD CONDITIONS Subtitle: OPERATING UPON 12 VOLT BATTERY CIRCUIT OF DEFINED VOLT-AMPERE CHARACTERISTICS. SEE SCALE. Roman Numeral: V Title: COLD AMPERES Y-Axis 1: AMPERE OUTPUT Y-Axis 2: OPERATING VOLTAGE X-Axis: DYNAMO SPEED (R.P.M.) Line Labels: Blumler (U.S.), Rotax (20/2) & Smith 20hp (S.C.), Rotax R.D. type (20/2), Scintilla-Bosch (Fr.), Westinghouse (U.S.), U.S.A Bosch (U.S.), Smith A.T.R. (A.C.) Handwritten Annotations: H / 22-8-20, E.T.C. / 23/11/20 GRAPH 4 (BOTTOM RIGHT): Header: AMPERE OUTPUT CURVES OF PLAIN SHUNT-WOUND DYNAMOS FOR HOT CONDITION Subtitle: OPERATING UPON 12 VOLT BATTERY CIRCUIT OF DEFINED VOLT-AMPERE CHARACTERISTIC SEE SCALES. Roman Numeral: VI Title: HOT AMPERES Y-Axis 1: AMPERE OUTPUT Y-Axis 2: OPERATING VOLTAGE X-Axis: DYNAMO SPEED (R.P.M.) Internal Note: Shunted performance of inherently controlled dynamo for Hot Line Labels: Bosch (Fr), Smith 20 h.p. (S.C.), Rotax R.D. type (20/2), Connock (Fr.), Blumler (U.S.), Westinghouse (U.S.), Smith A.T.R. (A.C.), Rotax (20/2), Scintilla - Bosch (Fr.), U.S.A Bosch (U.S.) Handwritten Annotations: A/L / 22-8-20, E.T.C. / 23/11/20 | ||