Popular Science Monthly 



699 



Washing Logs for Safety 



WASHING logs for safety before 

 they go to the sawmill is the 

 novel method employed in a lumber 

 camp in the West. As the photograph 

 shows, the logs are carried in a V-shaped 

 trough upon steel rollers which convey 

 them between jets of water of great 

 force. These jets strike the surface of 

 the logs, scouring them thoroughly on 

 all sides. The result is that the bits 

 of broken stone or other hard material 

 that might cling to the rough bark are 

 removed, and danger to life as well as 

 damage to property is averted, for if a 

 swiftly rotating saw hits a rock or nail in 

 a log it is likely to explode like a bomb 

 and send fragments of steel in every 

 direction. The washing of the logs 

 before they go to the saw is thus a safety 

 measure well worth while. 



Jets of water scour the log and remove broken 

 stones — a safety measure for sawmills 



Twitching Muscles by Means of the 

 Electric Current 



IX the treatment of certain ills it is 

 often desirable to introduce exercise, 

 but in cases of prolonged illness, the 

 muscular effort is often beyond the power 

 of the patient. To overcome this in- 

 ability to exercise, numerous devices 

 have been invented to provide automatic 

 exercise. One of these, much used in 

 sanatoria, where natural methods instead 

 of drugs are relied upon, is the "sinu- 

 soidal bath" with its many variations. 

 The bath is comparatively simple in 

 its operation. The unit tubs and warm 

 water provide electrical contacts; the 



sinusoidal apparatus is attached to an 

 ordinary light socket. The sinusoidal 

 current, which is painless in its applica- 

 tion, will produce muscular contractions, 



The man is taking a "sinusoidal bath." His 

 arm and leg muscles are being twitched elec- 

 trically to give them much -needed exercise 



mild or violent at the will of the oper- 

 ator. The length of the contraction is 

 regulated by a clock which breaks the 

 current. The current may be applied 

 in the four units simultaneously, but as 

 a rule, the curative quality is best trans- 

 mitted by alternate application. A 

 treatment usually lasts from twelve to 

 fifteen minutes. 



An Electrically-Lighted Clock 



ANEW YORK manufacturer has 

 recently brought out a compact 

 electrically-lighted clock, provided with 

 dry cells and a press button attached to 

 the end of a cord long enough to reach 

 from a nearby table or dresser to the 

 bed. A small switch 

 is fitted on the front 

 side of the box con- 

 taining the battery, 

 so that the light can 

 be burned con- 

 t i n u o u s 1 y 

 if desired. 



The long cord runs from the clock to your 



bed. To find out the time without getting 



up, press the button at your end of the 



cord. The clock is illuminated at once 



