H M'Tl.i; \ III. 



: bv the knife giving oul ;i shorl metallic sound 



j the ob For knives with j)lane under- 



n is ;..in advisable I" give less than 10 tilt. 



A Jth iinder-siirfare^. n the contrary, may 



be placed aim"-! hori/ontal. June's knife-holders 



tilt of ;il>..ut J, which is only enough for 



ctitiinir ribbons with hard paraffin. 



A ki ife with t". little tilt will often cut a second section, 



one, without tin- object being raised, showing 



that dun:,.'- the lir>t cut the object was pressed down by the 



k: . fd itself afterwards. This fault is denoted 



bv the riiiLriirj' tone given out by the knife on passing liack 



i- the object bcftii-i- the latter is 1'aisc'd. Such a knife 



'iit a dull rattling sound whilst cutting. Too little 



tilt foldiiiir - r puckering of sections, and does not 



allow of tin- cutting of the thinnest possible sections, as the 



ii"t bite eiK-iiL.-]). Jt is thus frequently a cause 



in-' iuied, or coining oil' thicker at one end 



than t he <>t her. 



-laming knife should have more tilt given to it than a 



-t one. 



Uibb.ui section-cutting ( 1-18) requires a relatively hard 



till. With celloidin it is very important 

 "id iiiHitlieient tilt, as the elastic celloidin yields before 

 an insufficiently tilted knife and is not cut. 



'he tilt of the knife ia given to a certain extent by the 



s "l'l w "th the microionie. \\'ith plane-concave 



it 'Jin be r.-gulaled to a certain extent by simply 



blad- over, It is more accurately n'ljnlutcd by 



'"''h.-inical contrivances, of which the most simple 



shaped wedges of NEUMAYER (see Jung's 



pair of these, each ground to the same angle, 



one of them ], laced (thin end towards the 



1 "" 1 '''-< : ""l the other (thick end towards the 



' " the clamping-arm of the knife-holder. 



Three pairs, having dill,. rent degrees of pitch, are supplied, 



or mosl work. Other contrivances to the 



that permit of rotating 



. and, though more costly, will be 



'"''"''' where much section-cutting has 



'''" r '' Jung's price-list, and various 



