Page:Popular Science Monthly Volume 90.djvu/902

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��Popular Science Monthly

��vessel ready for sea, her engines and equip- ment being found in very good condition. The two thousand tons of phosphate in her hold were left in place. Her cargo of 1,300 tons of coal was used on the trip to San Francisco. Before departing the vessel was christened Republic, and given American registry.

When she reached San Francisco the ship was thor- oughly over- hauled and re- paired at a cost, including the salvage, of $255- 000. Yet such was the scarcity of ships that she soon paid all expenses in- curred. On one trip alone she netted $360,000. She was. finally sold for the sum of $825,000.

���The cofferdam after it had been lowered in place. The thickness of the planks increased with the depth of immersion

��A Camera Timing-Release Which Enables You to Photograph Yourself

NUMEROUS methods, electric and otherwise, have been devised to enable a person to photograph himself. Some have proved to be successful, but they are usually tedious and difficult processes in which there is little certainty of success. Few equal in simplicity a method brought out by ElHs E. Bjorling, of Salt Lake City, Utah. The entire mechanism con- sists of a modified watch which can be carried about in the pocket. After the camera has been placed in posi- tion, the watch is set for the time it takes you to get into place, when the picture will be snapped immediately.

The watch has a moving plunger mounted in a small cylinder at its side. A flexible cable attached to the end of the plunger leads to the shutter-release on the camera. When the plunger is pressed inward to- wards the end of its cylinder, it compresses a spring. The plunger is held at the end of the cylinder by a

��der from the inside of the watch. The moving inward of the plunger will have also moved the cable, so that the camera- shutter is now set for the picture.

After this adjustment, the watch can be set to trip the plunger with any period of time not exceeding forty-five minutes. During this interval, in which you are get- ting into position in front of the camera,

the spring-latch will be gradu- ally pressed down by a lever. This lever is slowly turned by a pin on the minute-hand gear. It is pro- vided with a cam at its end. If the watch has been ad- justed for forty- five minutes, after three quarters of an hour the cam spring in from

��will have pressed the the cylinder. The plunger will be tripped and it will jump back, pulling the cable along with it. This operates the shutter.

���Ten Thousand Medical Officers Are Needed for a Million-Man Army

THERE are about one hundred and fifteen thousand physicians in the United States to care for the civil population and provide medical of- ficers for the Army and Navy. In the event of an army of one million men being called to the colors, seven thousand medical officers, or about six per cent of the physi- cians who are in the actual practice of their profes- sion, will be needed at once, and three thousand will later be needed for emergencies. This means that ten thousand phy- sicians will have to be entirely detached from It will require seven

��The plunger connected with the shutter is pressed in against the spring by the turning of the watch

their home practice

��spring-latch which projects into the cylin- hundred others a year to replace losses.

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