previous <<==>> next
TROEGER RECHENSCHEIBE
( 11" / 28 cm Diameter )
On the BACK SIDE is the KNOB to turn the inner scale:
K. EMIL TROEGER Mylau in Voigtland / Germany (1935)
*****************************************************************
S C A L E S of the CIRCULAR SLIDE RULE » TROEGER 2 «
=================================================================
D X outer circle
-----------------------------------------------------------------
C X inner circles
CI 1/X
MODEL » TROEGER 1 « ( 15 cm Diameter )
=================================================================
Only 2 Scales and NO CURSOR ===>>> Is a "PROPORTIONAL SCALE"
|
R E M A R K S :
=================================================================
Both Circular Slide Rules are made of Cardboard