PERFECTING THE DETAILS. 205 



be seen in Fig. 110. When the suspension plan is 

 adopted, side casters only just enough to steer the shelf 

 are used ; for nearly all the weight should be suspended 

 by the cords or wires. Figure 122 shows a homemade 

 style, a hard baked brick or a brick-shaped stone being 

 used to add its weight to that of the hammer, which 

 consists of a block of hard wood. This brick, B, is kept 

 in place by pieces of inch board. A is the shelf, at the 

 end of which is attached the concussion block, M. As 

 will be readily understood, M and A move at a blow, 

 compressing the spiral spring against the stick, jV, 

 which, with its attachments, is immovable. 



FIG. 98. BLOCK AND BOLTS TO 

 FASTEN TILT BOX TO AXLES. 



