REVOLVING HAT NEW ADVERTISING STUNT
A spinning hat bearing advertising messages is the latest wrinkle for sandwich men in Paris, France. A concealed switch
enables the wearer to start the hat revolving or stop it at will. Lest even this strange apparition fail to arrest the eyes of passers-by, the hat is also equipped with lights that flash on and off at the wearer’s control by means of a concealed switch.

Tricks That Enable You to Take Secret Pictures

TRICKS used by press photographers and detectives come in handy when it is desired to snap imposed photographs of friends or members of the family. For such pictures photographers usually use tiny, easily concealed cameras. Despite their size, these midget cameras are surprisingly fast and accurate, and their wide angle lenses make the use of a range finder unnecessary. One of the commoner ways of screening a camera from the intended subject is to cover it with a handkerchief until the trigger is released. Occasionally the camera is carried in a vest pocket with the lens shielded by the wearer’s coat. Read the rest of this entry »

How Light Bulbs Are Made

1 Pictures on this page show the steps in the process of making electric light bulbs. First, the tungsten wire filament is drawn through diamond dies. So fine is this wire, one-quarter the diameter of a hair, that it is extremely difficult to see it

2 Here is the mechanical spider that takes the fine tungsten wire and winds it around a steel wire form to shape the filament. An attendant watches the process through a microscope to be sure the spacing is accurate
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Frame Suspends Patient For Surgical Operation

ALTHOUGH it resembles a medieval torture machine in general appearance, a newly developed operating room frame is said to provide increased comfort for the patient and affords the surgeon free access to the field of operation. The frame is specially designed for fracture and orthopedic operating work.

The new apparatus employs the principle of suspension from above, rather than support from beneath and the patient’s body lies on padded rests at the head, small of the back, and below the thighs. The feet and hands are strapped to other supports on the frame

“TRUTH CHAMBER” DESIGNED TO WRING CONFESSIONS FROM CRIMINALS
A “truth chamber” recently devised by a New York criminologist is expected to wring confession of crime from a prisoner by compelling him to study his own features as he replies to a steady barrage of questions. It is a square cubicle with four mirrored walls. A battery of variously colored lights, suspended above the prisoner, plays upon him as he sits in the middle of the chamber. In the mirrors of the “truth chamber” he is able to note any suggestion of uneasiness in his manner or expression, and by changing the light from white to green or blue, detectives make him look worn and haggard. Convinced at last that his face and movements have already convicted him, the prisoner, the inventor believes, will confess.

New “Camera” Makes X-Ray Movies

MOTION pictures made with a rapid-fire X-ray “camera” devised by a Belgian radiologist will help physicians to study and to diagnose the ailments of moving body organs. Instead of making single shots, the machine exposes a series of large X-ray films in quick succession. This is done by mounting the specially slotted films upon a motor-driven revolving drum, seen within the machine in the right-hand view above. For examination, the resulting sheaf of pictures may then be transferred to motion-picture film and run off in a projector at any desired speed, so that the movements of the internal organs, as they appear on the film, are vividly shown on a conventional screen.

Trailer Chapel Has Speaker System

Built into a trailer, a chapel on wheels brings church services to isolated mountain sections of Virginia and West Virginia. Its rear wall unfolds to form a platform before the altar, and a canopy containing two loudspeakers for a public-address system, which carries the preacher’s voice to the congregation. A gasoline-driven generator mounted in the back of the sedan that draws the trailer supplies electric power for the public-address system and for cooking and lighting. Supplemented by a storage battery, the generator unit automatically starts when a light or appliance is turned on, and stops when all are switched off.