T E C H N I C A L   D A T A                 of the LASICO PLANIMETER
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Model 121-A   LOS ANGELES SCIENTIFIC INSTRUMENT CO./ USA   SN = 3419

Length = 8_1/4 "                  Unit of 0.015 sq.inch on scale 1:1
Adjustable Pole Arm ca. 7_1/2 "    Adjustable Tracer Arm ca. 6_1/4 "

Experimental  D E C I M A L  Calibration:                           
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Pol Arm    = 7_1/2" ( = const. Length )                             
Tracer Arm = 16.5   ( = Scale Setting ) = 168 mm ( = actual Length )
Vernier    = 1.000    = 100 sq.cm                                   

Hypothesis about the odd LASICO Constant = 15 sq.inch               
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Because  4" * 4" = 16 sq.inch  is nearly  10 cm * 10 cm = 100 sq.cm 
a "decimal calibrated" (German) PolarPlanimeter could be used and   
"re-calibrated" for US inches by modifying the lenght of P./T.Arms  

                     THEORY OF PLANIMETERS
impressum:
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© C.HAMANN        http://public.BHT-Berlin.de/hamann        10/10/05