A very efficient and cheap new method of sound reproduction
by W. E. SCHRAGE
AS shown by the great number of electrically transcribed programs on the radio, which gave such a setback to the phonograph industry, broadcasting even today relies to a considerable extent on mechanical sound recording.
Ancient Locks Portray Genius
One of the finest collections of locks and keys in the whole world is owned, not by a collector of rarest objects, but by an internationally famous locksmith. It includes over four hundred of the most valued and historical locks in the world and completely depicts the evolution of some of the intricate devices developed by mechanics down through the ages.
DESIGN a voice command system with the Siliconix CODEC & WIN an Apple!
Enter the Siliconix CODEC Design Contest and win an Apple II — the world’s best-selling personal computer — or another great prize. All you have to do is use Siliconix’ CODEC to design a microprocessor-based system which responds to your spoken words (or talks back to you).
Photographic Record of Telephone Meters
INSTEAD of the usual method of reading and recording the number registered by your telephone meter, transferring this to the accounting department where the record is copied and tabulated and the bills are made out, the newest system consists of supplying a photographic record of your phone number and the meter reading with your bill.
QUEER “FISH” FOR COSTLY SOUP
By W.G. FITZ-GERALD and H. H. DUNN
VERY great banquet begins with turtle soup, so that the traffic in these curious creatures is naturally a very profitable one, though extremely precarious withal. In the first place, while there are a great variety of turtles in tropic waters, only one kind is of any use for the much-sought soup.
Fame and Fortune from Sandwiches
The Sandwich King of Denmark and his two hundred varieties of Smoerrebroed.
THE proverb, “The way to a man’s heart lies through his stomach,” could well have originated in Denmark. The Danes love good food and, above all, they like their special sandwiches, called Smoerrebroed.
A CEMENT TILE FACTORY for your town — START ONE
AN AUTOMATIC MACHINE that makes 3,000 to 5,000 feet of drain tile per day—every work day in the year—makes a highly profitable business for some live man in every town. The demand is practically unlimited—drainage doubles farm production and farm values.
Germ-Killing Lights for Safer Surgery
Bacteria destroying lamps for the operating room were recently demonstrated to the American Society of Surgeons. The lamp (below) sends out ultra-violet rays which have the property of killing germs in 60 seconds, yet not harming the patient.