Exhibit 240 is one of a series of shunts for the Mavometer, Exhibit 166, a primitive type of multimeter, for measuring currents, voltages and resistances: this particular shunt served for the full scale reading from 1 to 100 mA. It appears as a small parallelepiped with one side of perforated metal and two terminals for the connection with the mavometer.
ISCRIZIONI
Inciso sulla parete di metallo: "ORIGINAL - GOSSEN ¶ D.R.G.M. ¶ 100 mA ¶ D.R.P.a."