Page:Popular Science Monthly Volume 92.djvu/595

 Popular Science Moiif/ili/

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��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

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