( 76 ) 



Tliese series may teach us in the lirst place lliat iiu change 

 wliatever in the general course of the cni-ve is effected by the 

 magnitude of \veight. The constants only are altered. The following 

 table will give an easier survey of the manner in which these 

 changes are effected. The weight is therein represented by L, Avhilst 

 ^1, B and C stand for the three constants of our forniula; in the 

 third column under ALV is given in gram-millimeters the amount 

 of work done multiplied by the w^riting-iever. This enlargement, 

 which in our case took place in the ratio of 5 : 1 will be denoted by V. 



In this table we may observe: 



1^^ . That at increment of weight the lifting-height diminishes, at 

 first sJowdy, afterwards more ra{)idly, an already well-kno\\'n fact. 



2"'^ That the work done increases at first rapidly, afterwards 

 more slowly. As we know, the work would, if the weight were still 

 further increased, attain at last a nia.ximum value and finally diminish. 



3'"'^ . That to all practical purposes the coefficitnt B remains 

 constant lolth increasiny ivei(/ht. For its mean value amounts to 

 0.02052, the largest deviation being at the utmost 3.8 7o> the most 

 probable value being : 0.02052 =t 0.000395. Furthermore the devia- 

 tions are irregular in both directions, so we may conclude that 

 under ideal technical conditions the increment-constant would have 

 remained, to all probability, wholly unaltered by different weights. 



4"^^ . That the constant C, i.e. the minimum threshold-value augments 

 at increment of loeight. I did not yet find this fact mentioned in 

 the literature within my reach. Still it may be easilj'^ verified even 

 witliout writing the r(?cord of a complete series, and it was proved 

 beyond any doubt within the limits of the experiment. 



With regard to the series here communicated, we ought to make 

 mention of the fact that still another series was written, the weight 

 therein being 200 Gr. ; this last series however showed technical 

 faults of too much iin])ortaiice, than that it could be employed for 

 the calculation of the constants. 



Besides the experiments on isotonical contractions with different 

 weights, 1 also investigated isometrical contractions. I believe that the 



