54 A B C OF THE STEEL SQUARE 



at the other end. The square would then be laid 

 on the plank with the face of the gauge against 

 its edge and the mark made around the point 

 of the square. This would be repeated until the 

 required number of steps were marked. The 

 gauges are made in two sizes, 18 and 28 inches 

 long. It is stated that mechanics who have used 

 it find it one of the handiest tools in their kits. 



Another style of fence is shown at Fig. 29 in 

 conjunction with a slotted square. This, per- 

 haps, is the handiest of all the devices for a 

 fence, but it is expensive, and as constructed re- 

 quires a square with a slot in each arm, and as 

 a rule workmen do not take kindly to squares 

 with slots in them. A shows the square, B the 

 fence, SS set screws to hold the fence in position, 

 and ff the points of the square. 



The application of the square and fence com- 

 bined for laying out a housed string for stairs is 

 shown at Fig. 30. In this example the fence is 

 a single slotted one, and three screws are em- 

 ployed to hold the square in position. The rise 

 is seven inches and the tread is laid off nine 

 inches on the blade. The square at the foot of 

 the string shows how the latter should be fin- 

 ished to make the floor and the base-board. ID 

 this case no pitch-board is required, as the square 



