Page:Popular Science Monthly Volume 91.djvu/923

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Popular Science Monthly To Open a Stubborn Knife- Blade, Throw It From You

THE next time the best blade of your pocket-knife refuses to open when you need it badly, give it a good reprimand and throw it away from you. But first place a corner of your handkerchief over the back of the blade and wind the rest of it tightly around the knife. Hold the opposite corner between the first and second fingers of your right hand, if you are right-handed, and give vent to your annoyance in the force of the throw. This will calm you con- siderably and by the time you traverse the distance over which you have flung the knife you will be in a forgiv- ing mood. When you pick up the knife you will find the blade opened. This is a bonafide method which will open the rustiest of knives without injury to the finger- nails. — C. S. Minter.

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���ne receiver

Amplifier ' passage

��Adjusting screw The Smallest Bandsaw — A Time and Labor Saver

THE smallest band- saw ever made is that recently patented by John A. Carlson of Seattle. Mr. Carlson was impressed by the need of a saw which would cut close on very fine work.

His small machine can be placed between every two benches. It is a miniature band- saw which has all the features of the ordinary bandsaw and several others of special value in a pattern shop. It can be set on a stand- ard on the floor or at- tached to a bench or table. It is electrical- ly operated.

Among the unusual features are safety de- vices which make the tool practically fool- proof, a tilting table with degree register and a locking device.

���Above: The helmet carries the telephone receiver and holds the transmitter in place

At left: Diagram of helmet and of the telephone appli- ances which make conversa- tion in an airplane possible

���The smallest bandsaw and its in- ventor. It is practically fool-proof

��Aviators Now Can Carry Their Tele- phones Under Their Hats

ANEW YORK man, Jesse L. Spence, has invented a helmet for the use of aviators which not on- ly provides them with a head covering but a telephone as well. Any one who has ever tried to talk while in an airplane knows how difficult it is. The loud noise made by the engine and the high wind pressure make conversation well nigh impossible. The type of helmet invented by Mr. Spence has a pocket which holds a tele- phonic receiver, ear tabs and a flaring tube leading away from the pocket which connects with an opening inside of the ear tabs. When two or more persons are in the airplane each wears a helmet.

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