| 摘要 |
PURPOSE:To easily check blown-out filament in electric bulbs by connecting parallel a current feed display device between the contacts of a power switch for the line to the bulbs, and connecting the contacts of relays to the line so that the bulbs are connected in series. CONSTITUTION:A plurality of electric bulbs L1, L2, Ln are connected in parallel with an electricity line 1, and the contacts S1, S2, Sn of relays R1, R2, Rn are connected with the line so that the bulbs L1, L2, Ln can be put in series connection to the line 1. In the daytime when the power switch 3 is left open, a blown- out filament in any bulb L can be judged easily from the condition of a pilot lamp 4. Therefore, the operator lights all bulbs L1, L2, Ln only when the pilot lamp 4 is extinguished and filament discontinuity in the bulb L is made sure, and he inspects the bulbs one by one. Thus effective inspecting works for electric bulbs are established.
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