946 



Popular Science Monthly 



be raised first and then the hand of the 

 same side. 



In gymnastic nomenclature the snap 

 under the bar is called "short underswing 

 for distance." It was first introduced as 

 an athletic event by 

 the author in 1900, 

 and was later adopted 

 by the A. L. N. A. 

 Stand, grasp the 

 vaulting bar, jump to 

 a momentary free 

 front rest, then drop 

 backward as though 

 about to start a back- 

 ward free circle. At a 

 point just below the 

 bar, flex the thighs 

 and then extend them 

 forward ; release the 

 grasp, project yourself 

 horizontally forward 

 as high as the bar. 

 Just before the feet 

 strike the floor swing 

 the arms forward to 

 bring the body to an 

 erect position. 



A regulation bar or 

 an adj ustable (in 

 height) horizontal bar 

 must be used. The 

 height of the bar must 

 be 4 ft. 9 in., meas- 

 ured from the top of 

 the bar. The bar 

 must not be raised 

 or lowered. A line is 

 drawn with the front edge extending from 

 center to center of the uprights and directly 

 beneath the horizontal bar. This is the 

 scratch line, and all measurements must 

 be made from the front edge of this line 

 at right angles to the nearest mark made 

 by any part of the person of the competitor. 

 The start is made with both feet on the 

 floor back of the scratch line and the hands 

 grasping the bar. Both feet must leave the 

 floor at the same time and may not leave 

 the floor more than once. The hands must 

 be grasping the bar when the feet leave 

 the floor. No part of the person of the 

 athlete should touch the bar. 



The author objects to the limitations of 

 these rules that have been adopted by the 

 A. L. N. A. It is far better to allow 

 liberty in the preparatory position and 

 movement just as in any other athletic 

 event. Some athletes prefer to start in the 



Climbing rope to 

 tambourine or bell 



standing position on the bar, and others 

 from a stand on one foot with a free swing 

 with the other. 



The snap under for height is an event 



listed by the A. L. N. A., and is not popular 



because of frequent injury to the forehead, 



due to striking the bar in the close pull-up. 



(The End.) 



Teeth of a Hack- Saw Blade Used 

 for Spacing on Section Liner . 



THE gaging device for the liner is made 

 of a 16-in. hack-saw blade, A, having 

 18 teeth to the inch. This is ground on the 

 sides to remove all set, then the points are 

 slightly rounded to remove the sharp 

 corners. It is preferable to select a soft 

 hack-saw blade as it can be straightened by 

 hammering the edge at the proper place. 

 The straight edge B is made of sheet steel 

 }/2 in. wide and 1/16 in. thick and is pivoted 

 at one end in the center of a half circle C 

 cut from No. 22-gage sheet bronze. The 

 heel of this piece comes to the back edge of 

 the saw-blade and a portion of each corner 

 D is turned back and over the back edge of 

 the saw-blade. A guide- block E is fastened 

 to the gage piece C to keep it in place on the 

 saw-blade. 



The semi-circular edge of the spacing 

 head has a slot, as shown, in which an ad- 

 justing thumb-nut is used to set the angle to 

 the blade. The edge is marked in degrees 

 so that this setting is easily accomplished. 

 The spacing arrangement consists of a 



The 1 teeth of the blade being accurately 

 cut, the spacing is made perfectly uniform 



knurled wheel F which has a stop-pin G to 

 limit the motion of the pawl H. A small 

 spring / holds the pawl in the teeth of the 

 saw-blade. A turn of the wheel forward 

 and back moves the straight edge up to a 

 new position, making the spacing perfectly 

 uniform with the spacing set by the stop- 

 pin. — C. S. Beardsley. 



