510 



Popular Science Monthly 



Motor-Testing Up To Date 



THE accompanying illustrations show 

 two methods which are used in 

 two motor-car factories for testing 

 every chassis before it is turned over to 

 the sales department for ultimate sale 

 to the consumer. 



In one method of scientific test- 

 ing the semi-finished chassis with the 

 motor in place is fastened beneath 

 great air-fans. The rear 

 wheels are belted to the 

 fans which act as a brake. 

 The motor is tested in this 

 way. The power it devel- 

 ops is used to test the re- 

 mainder of the chassis. 

 Three frames at a time are 

 tested. Following this test, 

 tires are put on the cars 

 and they are given a road 

 trial. 



In another method of 

 testing, the rear wheels of 



The Dog as a Carrier of Disease 



THE dog in the country is a useful 

 and pleasant adjunct to the farm if 

 he is properly controlled and cared for, 

 but when neglected, may readily become 

 a carrier of disease to stock, in addition 

 to gaining opportvmity to kill sheep and 

 destroy gardens and other property. Dog 

 ordinances, as a general rule, have been 

 intended chiefly to curb the dog's power 



Testing the horsepower of an automobile before 

 leaving the shop. With the aid of meters set up on 

 a support in front of the apparatus, the actual horse- 

 power delivered to the rear wheels is read directly 



the completed chassis are placed on large 

 rollers set beneath the floor of the test 

 house, and these rollers are geared to 

 electric d)'namometers which impose a 

 load on both the motor and the trans- 

 mission elements. \\'ith the aid of me- 

 ters, set up on a standard in front of the 

 operator, readings of the actual horse- 

 power delivered to the rear wheels can 

 be taken directly. Incidentally, it is in- 

 teresting to note that the power devel- 

 oped is not wasted but is used to light 

 the test house. 



The testing plant of a modern 

 automobile factory 



of doing harm by attacking, 

 biting, killing or running sheep 

 or stock. The part that he 

 plays as a carrier of diseases 

 to animals only recently has 

 been recognized according to 

 the zoologists of the Depart- 

 ment of Agriculture, who be- 

 lieve that when this is better 

 understood, rural ordinances 

 and laws which lessen this 

 danger will gain the support 

 of the community. 



Of the diseases carried to 

 stock by dogs, the foot-and- 

 mouth disease is probably of 

 the greatest interest at this 

 time. In this case the dog acts as a me- 

 chanical carrier of infection. The dog 

 which runs across an infected farm may 

 easily carry in the dirt on his feet the 

 virus of this most contagious of animal 

 diseases to other farms, and thus spread 

 the disease to the neighboring herds. 



There are, however, many other mal- 

 adies in the spread of which the dog 

 takes an active part. Rabies, hydatid, 

 ringworm, favus, double-pored tape- 

 worm, roundworm, and tongueworm are 

 often conveyed to human beings in this 



