Low Temperature Coefficient Quartz Crystals

T O U R I N G t h e p a s t several y e a r s a n u m b e r o f c r y s t a l p l a t e s h a v e b e e n f o u n d w h i c h h a v e t h e p r o p e r t y t h a t a t a specified t e m p e r a ture their frequency will n o t change w i t h a small change in temperature. T h e s e c r y s t a l s h a v e p r o v e d v e r y useful i n s t a b i l i z i n g t h e frequencies o f oscillators used i n f r e q u e n c y s t a n d a r d s , b r o a d c a s t i n g s t a t i o n s , r a d i o communication purposes. In transmitters, order to bring airplane out 74 transmitters, properties and and for other of their spheres usefulness a review a n d a m p l i f i c a t i o n o f t h e m a r e g i v e n i n t h i s p a p e r .