294 



Popular Science Monthly 



length and sharpen the spur. Drive two 

 smaller nails for drive-spurs and sharpen 

 them in like manner. The distance from 

 the center of the driving-spurs may be 

 varied to suit the work in hand. A screw- 

 center may be made by passing a wood 

 screw outward from the center of another 

 wooden face-plate wheel. A simple strip 

 of wood may be used in place of the wheels. 



Drilling may be done in the lathe by 

 using square shank, bit-stock twist drills. 

 Screw a wood wheel to the face-plate, find 

 its center and cut a square tapering hole to 

 receive the shank of the drill. Remove 

 the tool-rest and in its place set a small but 

 strongly made box about lo in. high and 

 5 in. wide. On the lower side of the box, 

 nail a strip of wood i in. square. This 

 strip slides in the channel in the lathe-bed 

 and keeps the box from turning around. 

 Move the tail-stock up to position and use 

 the tail-screw for advancing the work 

 against the drill. The material to be drilled 

 rests against the left side of the box, and 

 the screw bears against the right side. 

 If round material is to be drilled, gouge out 

 a semicircular channel in a wooden block, 

 place it against the side of the box, and let 

 the material lie in the channel. 



The jig-saw is supported by a baseboard 

 26 in. long, 6 in. wide and i in. thick, which 

 is bolted to the bed by using the bolt from 

 the tool-rest. The baseboard is slotted to 

 receive the bolt. The standard which 

 supports the saw-arms is fastened to the 

 baseboard by a tenon and wedge, as shown. 

 The standard may be of 2 by 3-in. stock. 

 Added strength may be given to the 

 standard by attaching a common shelf- 

 bracket. Cross strips are nailed to the 

 saw-table and to these strips and the base- 

 board are nailed four supporting strips. 

 The ends of the saw-arms are slotted to 

 receive two pieces of flat iron each 2}4 in. 

 long, ^ in. wide and 18 in. thick. These 

 are drilled to receive the pins which pass 

 through the arms, and the wing-bolts used 

 for clamping the saw. The construction of 

 the tightener for the saw is plainly indicated 

 in the drawing. 



The saw is driven by means of a 34 by 

 3-in. bolt inserted about ij^ in. from the 

 center of a hardwood face-plate wheel, 

 attached in place of the spur center. The 

 head of the bolt should be countersunk 

 into the wood and should be placed next 

 to the face-plate, so that the bolt cannot 

 by any chance come out while the saw is 

 in use. 



A Hand-Brake for a Flexible 

 Runner Sled 



AVERY efficient brake for the modern 

 flexible steel sleds may be constructed 

 of the following materials: 



2 small hinges and screws 



4 bolts J^-in. in diameter and 2^ in. long 



2 bolts }i-in. in diameter and i J-^ in. long 



I coil spring 



I piece of tire-iron 3 in. wide and 6 in. long 



I piece hardwood 24 in. long by I in. square 



I piece of hardwood 12 in. long, 3 in. wide 



and I in. thick 

 I piece hardwood 2 in. longer than width of 



sled and 3 in. wide by l in. thick 



The long piece of wood should be rounded 

 off on one end for a handle, then the three 



The parts of the 

 brake and how 

 they are attach- 

 ed to the sled 



pieces of wood are bolted together and the 

 hinges screwed on as shown. After this 

 part is complete the tire-iron is bent into 

 an L-shape and two 34-in. holes drilled 

 in one surface and bolted to the end of the 

 i2-in. piece. The brake is then ready to 

 be put on the sled, by screwing the hinges 

 to the long narrow pieces of the sled which 

 run parallel with the runners. The spring 

 is fastened between the 12-in. piece and 

 the under side of the sled in such a way that 

 it prevents the brake from dragging. A 

 pull on the handle will force the iron into 

 the snow and stop the sled. The spring 

 holds the handle of the brake level 

 with the top of the sled and is out 

 of the way until needed to stop the 

 sled. — Wm. a. Leech, Jr. 



