910 



Popular Science Monthly 



An inclined rear wall on the tender allows the coal to slide 

 steadily down to a point in front of the vibrating pushers 



forms of motive power can be 

 used with the apparatus. 

 The side walls may be made 

 to slope toward the center 

 with advantage, for gravity- 

 is a cheap force and should 

 be made use of wherever pos- 

 sible. The pushers extend 

 clear across the bottom of 

 the tender and move the en- 

 tire lower stratum of coal 

 with each forward stroke 

 of the reciprocating piston. 

 The device is the invention of 

 Charles L. Heisler, of Sche- 

 nectady, N. Y. 



Supplying Coal to the Engine by 

 Means of Vibrating Pushers 



WHEN the coal bin of a locomotive is 

 full there is but a step between the 

 fireman and the supply, but as the great 

 iron horse eats back its food supply there is 

 another step and then another, until firing 

 partakes of the nature of a Marathon race. 

 How to get the coal to the firemen in a big 

 modern locomotive is a problem to which 

 inventors have been giving their attention. 



Strictly speaking, the device which is 

 illustrated and which is intended to solve 

 this problem is a vibrator rather 

 than a conveyer, for the coal is 

 not carried from point to point in 

 a receptacle but is shoved by a 

 vibrating pusher, which the: 

 recedes, allowing more coal 

 to drop in front of it, and 

 then pushing that on- 

 ward, the movement 

 being transmitted to the 

 fuel in front. The 

 pushers are actuated 

 by a reciprocating pis- 

 ton, suitably governed, 

 and preferably situated 

 in the engine proper, 

 but with such readily, 

 detachable connections 

 that the tender can be 

 disconnected from the 

 locomotive when desired. 



The mechanism is con- 

 trolled by a lever, which regu- 

 lates a throttle in the steam 

 connection with the vibrating 

 piston and cylinder and which 

 is under the direct manage- 

 ment of the fireman. Other 



A^ 



A bulb inside the device throws 

 its light around the egg 



Candling Eggs in the Newest Way 

 Without the Aid of a Dark Room 



,S far as the consumer is concerned 

 there are only two kinds of eggs — • 

 good ones and bad ones; and usually he 

 cannot distinguish one from the other 

 until he breaks the shell. But to the 

 dealer there are several grades between 



the best and the 

 ^tm..ECE unusable eggs. 



P I .OPENING foR E,&<5 For years these 

 I'iPHOAGM PRt55ED grades have been 



'■5T REFLXTOR , J . , , 



determined by 

 candling — a pro- 

 cess requiring a 

 dark room and a 

 point of light 

 against which the 

 egg is held to get 

 a kind of X-Ray 

 view of its in- 

 terior. The pro- 

 cess is slow and 

 the conditions 

 under which the men 

 must work are more 

 or less unsanitary. 



A newer method em- 

 ploys the candling de- 

 vice shown in the il- 

 lustration. This device 

 confines the dark area 

 where it belongs — just 

 around the egg. The 

 projection on top of the 

 device has a slight slant so 

 that it is impossible for any 

 light to get to the egg from 

 above. With this device one 

 room may be used for can- 

 dling, grading and packing. 



