For dynamo machines, the following designations are proposed:
| The machine itself. | D |
| Positive terminal. | +T |
| Negative terminal. | -T |
| Magnet forming the field. | FM |
| Current indicator (amperemeter). | AM |
| Tension indicator (voltameter). | MV |
| Electro-magnet. | EM |
| Luminous intensity of a lamp, in candles. | c.p. |
| Resistance of the armature. | Ra |
| Resistance of the magnet forming the field. | Rm |
| Resistance of the external circuit. | Ro |
| Intensity in the armature. | Ca |
| Intensity in the coils of the magnet. | Cm |
| Intensity in the external circuit. | Ce |
| Coefficient of self-induction. | Ls |
| Coefficient of mutual induction. | Lm |
A primary battery would be represented as in Fig. 1, and a battery of accumulators as in Fig. 2.
FIG. 1.
FIG. 2.
In order to designate incandescent lamps, circles would be used, and stars for arc lamps. A system of incandescent lamps arranged in multiple arc would be represented as in Fig. 3.
