Popular Science Monthly 



645 



An Automatic Map-Maker. It 

 Surveys by Wagon Jolts 



THE photograph at the bottom of the 

 page shows a map-making machine. 

 It is the invention 

 of Theodore Bodde, 

 Westfield, N. J., and 

 F. E. Austin, Hanover, , 

 N. H. A shaft at the '■ 

 forward end of the ma- 

 chine is belted to a 

 pulley attached to 

 the hub of the rear 

 wheel. This shaft 

 is geared to a rod 

 on which are 

 mounted beveled wheels that 

 rotate the map paper. One 

 of the boards carries the 

 drawing paper. A spring- 

 supported pencil is arranged to mark on the 

 paper as the wagon proceeds. When a map 

 line has been drawn completely across the 

 paper an alarm bell is automatically rung 

 to warn the operator to shift the mechanism 

 into position for making another map. So 

 long as the machine or wagon is traveling 

 on a level road both disks are stationary 

 and only a straight map line is marked on 

 the paper as it is moved 'past the pencil 

 point. But when the wagon turns a corner, 

 a set of g>-roscopes geared together are ar- 

 ranged to turn the map board so that the 

 map paper is also turned relatively to the 

 pencil point, thus indicating the turn of 

 the road by a deviation in the line marked 

 on the paper. Any error in the marking 

 that would naturally occur through an 

 up-grade in the road is automatically 

 corrected on the map by a pendulum at- 

 tachment which 

 regulates the 

 rectilinear mo- 

 tion of the map 

 paper so that it 

 is a 1 w a >' s in 

 proportion to 

 the horizontal 

 length of the 

 road. The ma- 

 chine shown has 

 been put to ac- 

 tual use with 

 entire success. 

 The inventor 

 claims that it 

 is more reliable 

 than the ordi- 

 nary method. 



The wagon carries a revolving map paper and a spring- 

 suspended pencil which records the lines of the road 



Scrape the bottoms of your shoes on the 

 little iron bar and then wipe them on 

 the mat before entering the automobile 



Don't Soil Your Car Floor— Wipe 

 Your Feet at the Door 



A SIMPLE but effective way of pre- 

 venting muddy shoes from soiling the 

 interior of an automobile has lately been 

 brought out by William A. Roos, of New 

 York city. It consists of a small square 

 mat, with a short iron bar in front, which 

 can be brought down flat on the running- 

 board for use. The mat is made up of a 

 number of short stiff bristles. 



The bottoms of the shoes are scraped over 

 the front iron bar, which projects over the 

 edge of the running-board as shown, so 

 the mud drops down to the ground. The 

 dirt still remaining on the shoes can be 

 removed by the bristles of the mat. 



The device folds back into a pocket after 

 it has been used. The last person entering 

 the automobile catches the bottom of 

 the bar with the toe of his shoe and swings 

 it up. Catches on the hinges then hold the 

 device close against the vertical side of the 



running-board 

 of the car. 



The back of 

 thematis enam- 

 eled and finish- 

 ed in such a way 

 that it is not 

 noticeable as a 

 separate de- 

 vice when fold- 

 ed back into 

 its pocket. The 

 floor of the au- 

 tomobile will 

 thus be kept 

 tidy and more 

 comfortable in 

 damp or sloppy 

 weather. 



