A Stop to Thefts of Lamp Bulbs
Page 10
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TO prevent the theft of lighting bulbs from the fittings in buses, Simms Motor Units, Ltd., Oak Lane, East Finchley, London, N.2, has developed a novel device, for which a patent is being sought.
It consists of a spring-loaded locking plate containing two slots, which, in its nOrmal position, blocks the two normal slots in the bulb holder. When pressure is applied, the plate is moved over against the spring until the four slats are in line, when the bulb can be removed in the normal manner.
As shown in the accompanying illustration, there is a small hole in the lamp reflector, opposite one end of the locking plate, through which any convenient implement may be inserted to actuate the locking plate and permit removal of the bulb.
Simms Motor Units, Ltd., is willing to grant licences for the manufacture of this device.
PLASTIC-BONDED GRINDING DISCS
GRIND1NG discs in which a syn1,-1 thethic resin is used as the bonding medium are described in a folder recently published by the Helvetia Abrasives Co., Ltd., Thurmaston, 'near Leicester.
Advantages claimed for the plastic bonding are that it is non-porous, is practically insoluble, has a low moisture content, and is heat-proof and water-proof. These discs are suitable for use on both metal and stone work.