6↓ ↓g1511|l2161|10 Fig. 2. Doubly excited symmetrical ladder network. Fig 3. Modification of Fig. 1 R4=VAN1=(4G2+8G+2)/(4G2+12G+8)9 AN=E=VBN+17(2G)=(4G2+8G+2) (2G2+4G+1)(2G2+6G+4)9 Is=VAM2=(2G2+4G+1), The procedure outlined in the note is suitable for class- room use. For a given value of G(say G=1), the effective I1=1y+l9=(2G2+6G+4) resistance Ro or R can be computed in a short time If we use the same source to provide the two voltage in- by that source would he lili. Thus I,(4G-+12G ME6(94)u, "polygons of unequal resistors,"AmJPhys. 62, puts of the network as shown in Fig. 2, the current delivered Van Valkenberg, Newwork Analysis(Prentice- Englewood +8).Thus, Cliffs, NJ, 1964) THE METRIC SYSTEM The only case for the French metric system is that it has become sufficiently universal so tha there are real advantages in making it completely universal. It cannot claim the slightest scientific alidity as its units are not based on any natural units and are psychologically not even particularly convenient. The decimal system is one of the less convenient systems of counting, though by no means the worst. The only argument for it is that when it doesnt really matter what we do, it is convenient to have everybody do the same thing, so let's all join the party Kenneth Boulding, Numbers and Measurement on a Human Scale, in The Metric Debate, edited by David F. Bartlett ( Colorado Associated University Press, Boulder, 1980), P. 64. Am J Phys., Vol 68, No 5, May 2000 Notes and discussionsVAN5E5VBN1I7~2G!5~4G218G12!, I95VAN/25~2G214G11!, I115I71I95~2G216G14!. If we use the same source to provide the two voltage in￾puts of the network as shown in Fig. 2, the current delivered by that source would be I111I12 . Thus Is5(4G2112G 18). Thus, R45VAN /Is5~4G218G12!/~4G2112G18!V 5~2G214G11!/~2G216G14!V. The procedure outlined in the note is suitable for class￾room use. For a given value of G ~say G51!, the effective resistance R9 or R8 can be computed in a short time. 1 Satinder S. Sidhu, ‘‘Polygons of unequal resistors,’’ Am. J. Phys. 62, 815–816 ~1994!. 2 M. E. Van Valkenberg, Network Analysis ~Prentice–Hall, Englewood Cliffs, NJ, 1964!. THE METRIC SYSTEM The only case for the French metric system is that it has become sufficiently universal so that there are real advantages in making it completely universal. It cannot claim the slightest scientific validity as its units are not based on any natural units and are psychologically not even particularly convenient. The decimal system is one of the less convenient systems of counting, though by no means the worst. The only argument for it is that when it doesn’t really matter what we do, it is convenient to have everybody do the same thing, so let’s all join the party. Kenneth Boulding, ‘‘Numbers and Measurement on a Human Scale,’’ in The Metric Debate, edited by David F. Bartlett ~Colorado Associated University Press, Boulder, 1980!, p. 64. Fig. 2. Doubly excited symmetrical ladder network. Fig. 3. Modification of Fig. 1. 485 Am. J. Phys., Vol. 68, No. 5, May 2000 Notes and Discussions 485