Popular Science MoiitJibj 



27 



slight pressure that it is capable of bodily 

 vibration by the energy of sound waves. 



These two members may be employed 

 in a circuit with a relay or other magnet 

 whose armature is acted upon by a con- 

 stant counter force or spring, the force of 

 which may be regulated to move the 

 armature beyond the operative influence 

 of the magnet, or not, as de- 

 sired. In the case of the toy 

 dog, the force of the spring 

 is such that the arma- 

 ture is thrown be- 

 yond the influence .;• 

 of the magnet so 

 that the dog must be 

 put back into his ken- 

 nel by hand and 

 placed up against the 

 magnet bar before he 

 is again ready to be 

 clapped out. . 



With the electric 

 train, the magnetic 

 armature, instead of 

 closing a relay circuit 

 on each actuation 

 serves to reverse it. 



Barbers may now sharpen shears 

 with ease and sureness of result 



Sharpen Your Own Shears and Save 

 Your Time and Temper 



THE new grinding device, shown in the 

 accompanying illustration, is de- 

 signed to enable the barber, in a small 

 town, to sharpen his own shears. It makes 

 it unnecessary to send many dulled shears 

 to a barber's supply house at a dis- 

 tance with the resulting delay. The 

 new device is portable 

 and may be screwed 

 to the edge of any 

 table, where it is ready 

 to be used. 



The contrivance consists 

 of a small grinding wheel 

 mounted on a vertical 

 shaft. A crank and worm 

 gear supply the power. The 

 pair of shears is held in a 

 clamp at the top of the 

 wheel, as shown. The 

 clamp slides on a metal 

 rod so that the shears may 

 be drawn across the face of 

 the grinding wheel as it 

 is revolved. 



A Horn of Natural Rock. It Can Be 

 Heard Six Miles 



KING ALFRED'S Horn" is the name 

 applied to a great shapeless block 

 of stone in the Vale of Berks, England. 

 It is pierced with a number of holes. 

 By applying his mouth to it and 

 blowing as in- 

 to a horn, the 

 practiced per- 

 former can 

 produce a 

 weird, boom- 

 ing sound, said 

 to be audible 

 for a distance 

 of six miles. 

 The story goes 

 that King Al- 

 fred used this 

 natural horn to 

 summon his 

 forces for a 

 great battle, 

 fought in the 

 immediate 

 neighborhood. 



Trunks land on rubber 

 local man makes the 



The Trunk-Smasher Is Foiled at Last 

 by the Rubber Mat 



NO matter how strong and well built 

 a trunk may be, it will not long sur- 

 vive if the average baggageman gets a 

 chance to "strafe" it. A Los Angeles 

 man would get around this by providing 



rubber mats 

 ^ for trunks to 

 land on. 



According 

 to his plan, the 

 mats- may 

 readily be 

 made of heavy 

 garden or 

 other hose held 

 together by a 

 pair of rods. 

 Using these 

 mats, the bag- 

 gageman may 

 handle trunks 

 with his usud 

 roughness 

 without injur- 

 ing them. 



mats in Los Angeles. A 

 mats of old garden hose 



