440 PHILOSOPHICAL TRANSACTIONS. [aNNO I678. 



added to the serpent, making an angle of 25 degrees with FF and KK, which 

 serve to depress a bascule or sweep, which is in the arm that carries the shuttle. 

 The treddles differ in nothing from those which are commonly used, only the 

 cords that hold them pendent from the ground are fixed in the elbows of the 

 serpent, which in turning raises and depresses them by the help of two little 

 pulleys on which the ropes turn. — The clapper is supported between two pillars, 

 with a rope double twisted, which causes it to make a kind of a spring, and 

 naturally to yield forwards, to beat the cloth. — LM is one of the arms which 

 pass freely into the canal or pipe NN, supported by four pillars of wood OOOO. 

 Its motion proceeds from the following parts : PQ is a bascule which, though 

 unequally divided by its supporter R, is yet in equilibrio, the end PR being 

 made to weigh exactly as much as RQ. — At the extremity of this bascule is tied 

 a cord, which passes through the pulley S, and terminates at the extremity of 

 the arm, where it is fastened to a little bowl M. At the other extremity of the 

 same arm, towards L is also fastened underneath a cord, which passes through 

 the pulley T, and carries the weight V. — At the same end of the arm is added 

 a little nich Z, about the size of half the shuttle : then over a little bar X Y, 

 which passes athwart the arm, there are two other little pieces of wood, having 

 at the end of them two teeth, which enter into the nich Z through two holes, 

 which are on both the sides. 



To the ends of these little pieces of wood there is a small bow of whalebone 

 or steel, which keeps the two ends asunder, and forces the teeth, which are at 

 the other end, to enter into the nich before the said pieces themselves. At the 

 points 1 1 are two ropes, that pass through the pulley 22, fastened to the pillars 

 3 4, having each of them a little weight at the end large enough to keep it 

 from passing through a little bowl which is under each pulley. 



This arm so disposed goes and comes in the hole NN in the following man- 

 ner. One tooth of the serpent already described, strikes on the extremity of 

 the bascule PQ, and so causes the end Q to rise up, which drawing the cord 

 fastened to the point Q, makes the arm LM to advance forward. But when 

 afterwards the tooth of the serpent is come out, then the weight V tied to the 

 other end of the same arm by a cord, that passes through the pulley T, forces 

 the said arm by its own weight to return again. — When the arm LM is in its 

 ordinary place, the two little pieces of wood into which the bar X Y enters, en- 

 close the shuttle by means of the whalebone spring. But when the said arm ap- 

 proaches the other opposite arm, then the cords tied to the points II being a 

 little too short, and the weight which is at the end of them not being able to 

 pass through, the spring gives way a little, and so the shuttle is no longer en- 



