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with all facts simply and completely stated in the shortest possible form.
     In Radio you will have occasion to use all kinds of tables-- tables of logarithms, squares (Table No. 2), of resistance (Table

TABLE NO. 2

Number	Square	Cube	Log	Number	Square	Cube	Log
1	1	1	0.000	7	49	343	0.845
2	4	8	0.301	8	64	512	0.903
3	9	27	0.477	9	81	729	0.954
4	16	64	0.602	10	100	1000	1.000
5	25	125	0.699	11	121	1331	1.041
6	36	216	0.778	12	144	1728	1.079

No. 3), etc. All these will have very definite meanings to us-- their use will serve to complete mental pictures for us--they are: part of the Radio-Trician's language.     
     The job of working with electrical and Radio measurements

TABLE NO. 3
Table of comparative resistance.

Silver	1.00	Platinum	7.20
Copper	1.11	German Silver	14.20
Aluminum	1.87	Hard Steel	13.50
Nickel	4.67	Mercury	63.1
Soft Iron	6.00

is really made easy for us because the metric system is used almost entirely. The metric system is based on the decimal system--all the various units are expressed in multiples of 10. Table No. 4 shows what is meant by this. Instead of having

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Content	©1931, National Radio Institute
Webpage	©1997, Nostalgia Air
Transcriber	Richard Lancaster