Show new screen methods As a substitute for glass con slides film strips may now be shown on a screen from u projector and blits method has been idaile simpler still by a camera which enables tha operator to make his own negative rolls says popular mechanics A length of the film which will give as many pictures as would 30 pounds of glass slides weighs hardly un ounce the rolls can be printed directly on positive alm for use in the projector with this travelers may have a convenient record of their trip to show their friends and the apparatus Is especially serviceable to lecturers etc |