Light bulbs in the New York City subway system screw in “backwards” (i.e. with left-handed threads) so people won’t steal them to use at home.

Edison screw Three-way E26d light socket E26 Edison screw to NEMA 1-15 adapter Specifications for all lamp mount types are defined in the following American National Standards Institute (ANSI) and International Electrotechnical Commission (IEC) publications: Lamp Caps—ANSI C81.61 and IEC 60061-1 Lamp Holders—NSI C81.62 and IEC 60061-2 Gauges (to ensure interchangeability)—ANSI C81.63 and IEC 60061-3 …

Light bulbs in the New York City subway system screw in “backwards” (i.e. with left-handed threads) so people won’t steal them to use at home. Read More »