Popular Science Monthly 



296 



the bolt ends from the nuts was riveted 

 over. Ordinary rivets can be used in place 

 of the bolts, if they are put in hot. 



The trailer frame was made of 3 by 

 1 13/16-in. channel iron with cross-pieces 

 riveted in place, corner braces at each 

 end and corner plates. The plate E is 

 12 in. wide and % * n - thick, and as long as 

 the trailer chassis is wide. It is securely 

 riveted to the frame and cross-member F. 

 The plate G is 12 in. wide, cut to shape 

 from %-'m. stock. Two circular plates H, 

 2% in. in diameter, were cut out and 

 fastened in the center of each upper (G) 

 and lower (E) plates. A 2-in. hole was 

 then drilled through the center of both 

 circular plates and the plates G and E 

 for the king pin or bolt /, which was made 

 of 1 31/32-in. stock with a i3^ by 3-in. 

 head, and a steel washer 2>}A by M" m - 

 under the head. This bolt is 10 in. long 

 with a 4-in. length of threads. A spiral 

 spring J was placed on the end of the 

 bolt under the washer where it was secured 

 under light tension with a nut, locknut 

 and cotter. 



A groove was cut in each of the plates 

 H for a grease retainer. Two holes were 

 drilled in the plate G for two %-in. bolts 

 to serve as bumpers for any side thrust 

 that might be made. 



The floor of the trailer was placed on 

 five pieces L cut from 2 by 8-in. oak. 

 These were fastened with long bolts M, 

 as shown. The opening left in the front 

 part of the housing for the differential was 

 covered with a plate bolted in place. 

 The detail N is for irons to hold the stakes, 

 is for the king bolt and P for the bracket 

 connections. 



Inflation and Weight Governs the 

 Resiliency of Tires 



RESILIENCY of the tires is primarily 

 u governed by the construction and 

 quality, but is largely influenced by the 

 inflation and weight carried. Naturally a 

 4-in. tire inflated to 70 lb. air pressure 

 and carrying 800 lb. weight will ride easier 

 than the same size tire with the same infla- 

 tion, and carrying 700 lb. weight. The 

 heavier weight causes more deflection of 

 the tires on the ground and increases the 

 action of the side walls, thereby adding 

 to the comfort of the ride. Increasing the 

 deflection or flattening of tires, either by 

 extra weight or reducing the air pressure, 

 causes more of the vibration to be absorbed 

 by the tires than by the springs of the car. 



A Cement Wash to Be Applied to a 

 Damp Wall 



A GOOD cement wash for a damp wall 

 may be made with 7 parts of soft, 

 clear water, 1 pint of lime water and 2 oz. 

 of table salt. Stir the cement enough 

 to form a paint, adding any earth color 

 desired, or use plain. 



A Porch Swing Made from Your 

 Favorite Rocking-Chair 



A COMFORTABLE rocker can be 

 converted into a swing without alter- 

 ing or defacing the chair. The materials 

 needed are two strips of wood about ij^ 

 by 1 1 /2 in- and about 8 in. longer than the 

 width of the chair seat; two sets of ham- 

 mock chains; six stout screw-eyes and four 

 long, slim wood screws. 



The strips are fastened with screws to 

 the under part of the seat frame. The 

 chains are suspended from two screw-eyes 

 set in a joist in the porch ceiling and are 

 hooked into screw-eyes set near the ends 

 of the two cross-pieces. 



Auxiliary frame under seat of a rocking- 

 chair for fastening the ends of the chains 



When the swing season is over, these 

 attachments may be easily removed and 

 neither the chair nor the porch will be 

 any the worse for the out-of-doors usage of 

 the chair.— T. H. Linthicum. 



