Popular Science Moiif/ili/ 



7!) 



THE electric heafilij^ht of a locomotive 

 can be focused with a very high de- 



Here is a new spectacle 

 frame which will bend to 

 any extent without break- 

 ing. Most spectacle- 

 wearers will welcome thi") 



A Side-Piece for Eye Glasses Which Focusing the Locomotive Headlight 

 Will Not Break With a New Adjusting Device 



ONE of the new devices for glasses, of 

 interest to the person who uses the 

 style with side- 

 pieces, is a very 

 flexible side- 

 piece which 

 does not break 

 even when it is 

 subjected to 

 considerable 

 bending. The 



new side-piece, beside resisting 

 breaking, does not get out of 

 shape. It is constructed so that 

 it has a flat side which tapers gracefully 

 to the end piece. This flat side gives it 

 springiness, so that it returns to its proper 

 position after being bent in or out. The 

 construction of the side-pieces also keeps 

 the glasses from getting out of alignment. 

 All wearers of spectacles will appreciate 

 this innovation. Everyone knows the 

 ease with which the ordinary spectacle 

 frame can be damaged, and such break- 

 ages, if they come at all frequently, are 

 very expensive. Outdoor workers, in 

 particular, will welcome a spectacle frame 

 that is unbreakable. It is not only the 

 frame that is likely to break, but, on 

 rimless glasses, the lenses may go. A 

 frame which will take up any strain to 

 which it may be subjected will save them. 



gree of pre- 

 c i s i o n by 

 means of an 

 improved mi- 

 crometer fo- 

 cusing device. 

 It provides for 

 vertical, hori- 

 zontal, and 

 lateral movements of the 

 lamp, each independently of 

 the other, so that compensa- 

 tion may be made for non-symmetrical 

 reflector curves and irregularities of lamp 

 manufacture. While a high degree of ac- 

 curacy is possible, the adjustments may 

 be made by a person inexperienced in the 

 handling of instruments of great precision. 

 Each moving part is spring cushioned 

 against the wearing effect of locomotive 

 vibration. The device may be also used 

 when an oil or gas 

 burning headlight is 

 converted to an elec- 

 tric light, as 

 any experi- 

 e n c e d me- 

 chanic can 

 install it. 



The focusing device described above permits of exceedingly fine optical adjustment of 

 locomotive headlights, and the penetrating power is very considerably increased by iti use 



