The values, however, were so large that it was necessary to leave off the last three ciphers and state that the values given are in "thousands of tons." Though the dropping of ciphers is very common, it is a practice likely to lead to serious error and should not be encouraged. Even with the ciphers omitted, the values could not possibly have been given inside the bar if more countries had been included in the list, or if the scale had been any smaller than that shown here. To place above each bar the title for that bar is not good practice. In general, it is desirable to have a

GRAPHIC METHODS

title for each bar at the left, then the figures, then the bar. With such an arrangement, one title will be below another, easily perceived by the eye, and the figures will all be in one column with the decimal points

in a straight line. ^_^T^. "^"^'^ states . .^93 ^■■^^h^^HH^ Figures running ^ - ^ I -- - ^ mexico si ^m

. . V ' ^ ^ ^ SPAIN etPORTUGAL, 52 ■■

into millions can be ^" j ^ ■■■ -- ^ -japan 4z ^

•1 1 i> 1 \ ^ \ -^ CHILE 4Z H| THOUSANDS of Tons

easily read from long ^^ p^ Australia. .34 ■

columns if sufiicient ^^_^g ^^"^ ['/[['^m white paper is left

between figures in ^'^- ^4- Production of Copper in Different Countries . J^ for One Year

Xne VerTlCai arrang,e- This chart is a redrawing of Fig. 25. The title here should state the year, nient and if each '^"^ ^^^^ ^'^^ °'^'' S^^'^^ ''^ the book from which Fig. 25 was taken