Popular Science MoNfhl// 



California produce peddlers are nothing if not enterpris- 

 ing, and the automobile has, with them, replaced the horse 



The Vegetable Peddler Adopts the 

 Fast Motor-Truck 



THE motor-truck is being used in 

 Southern California as a vegetable 

 store on wheels. For some time prior 

 to the use of the truck for this purpose 

 the lowly horse had been used to draw 

 the vegetable wagon up one street and 

 down the 

 next, but so 

 much more 

 efficient 

 is the truck 

 for this pur- 

 pose that it 

 is being 

 rapidly 

 taken up by 

 C alif ornia 

 produce 

 peddle rs. 



Upon the 

 regular 

 truck plat- 

 iorm special- 

 ly-designed 

 vegetable- 

 carrying 



bodies are being constructed, the lower 

 deck being the salesroom, while the upper 

 floor is intended to hold the reserve supply. 

 More than thirty per cent more 

 can be covered by 

 one of these vege- 

 table-trucks in a 

 day than by the 

 old horse-drawn ve- 

 hicle. The result 

 is increased profits, 

 a neater appearance 

 and much time 

 saved. 



The bodies are of 

 the "quick detach- 

 able" variety, so 

 that it is a common 

 sight to see a vege- 

 table vendor and 

 his family touring 

 on Sundays and 

 holidays. 



In fact, the money 

 invested in su:;h a 

 motor-truck is con- 

 sidered well-spent 

 by the peddler. 



New 



l\ 111 



ground 



WKer\ 

 closed^ 



()(;o 



Automobile Muffler Works 

 on Vacuum Principle 



automobile engineers have ad- 

 mitted that the present type of 

 muffler in which the gases are allowed to 

 expand from a small pipe into the muffler 

 and are then carried back and forth 

 through passageways, is inefficient be- 

 cause it in- 

 creases the 

 engine back- 

 pressure 

 and prevents 

 a rapid exit 

 of the burned 

 exhaust 

 gases. The 

 new muffler 

 is a noise- 

 d e a d e n er 

 because it 

 prevents the 

 sudden ex- 

 pansion of 

 t Ii e com- 

 pressed 

 gases to the 

 lower at- 

 mospheric pressure. The exhaust gases 

 enter the muffler perpendicularly and 

 strike against a small conical surface 

 which divides them up into numerous 



6s5e5 in 



Cone for 

 deflecting 



Small strean^ 

 between adjacent 

 radial fins 



Details and general appearance of the new 

 principle, disk-shaped automobile silencer 



small streams by 

 means of two sets of 

 radial fins. These 

 little discharges are 

 delivered to the muf- 

 fler exit one by one, 

 since the paths to the 

 opening are of dif- 

 ferent lengths, thus 

 avoiding the noise 

 caused by the ex- 

 plosion of a larger 

 volume of gas. Each 

 small discharge 

 stream is also in con- 

 tact with the muffler 

 walls, so that it is 

 cooled and its volume 

 decreased on the way 

 out. With this muf- 

 fler, the gas engine is 

 able to produce 

 more power and 

 efficiency. 



