pressure
points J
F I G . 15. S t e p s in m a k i n g g l a s s k n i v e s .
(f) G l a z i e r ' s p l i e r s , m o d i f i e d w i t h n a r r o w s t r i p s of ( b l a c k ) t a p e to p r o d u c e a f u l c r u m
a n d p r e s s u r e p o i n t s t o b r e a k g l a s s , a n d ( w h i t e ) t a p e t o d a m p e n t h e i r a c t i o n ; a l s o , a
s c o r i n g t o o l .
(a) R e c t a n g l e o f g l a s s m e a s u r e d so t h a t b r e a k w i l l d i v i d e g l a s s i n t o t w o p i e c e s w i t h
e q u a l m a s s .
(Legend
continued
on next
page.)
153
k fulcrum