This map, costing several hundred dollars to produce, could be injured severely by a few strokes of a janitor's feather duster. If short pins were used with spherical heads in contact with the map there would be no danger of the pins being misplaced. Another disadvantage of the long steel pins is that the steel portion exposed to the atmosphere is likely to rust, especially in cities near salt water. Pins with short needle-points pushed entirely into cork composition or corrugated straw-board have little opportunity to rust.

Fig. 195 shows a convenient map scheme by which different places on the map are numbered so that detailed information regarding each may be obtained from the annexed tabulation numbered to correspond with the pin numbers. In this scheme we have all the advantages of a pin map without the confusion of too many data on the surface of the map itself. The illustration of Fig. 195 was evidently prepared by hand. Such an illustration can, however, be made by using pins like those shown in Fig. 196, or like pin No. 20 in Fig. 199. This latter

MAPS AND PINS

No

R-R.

Cap. Bbls. per day

1,BOO

?.

H«LDEaBERa Cem. Co

. . . Howo Can, N. Y .

., D. A H.R R

AJfloo.N. Y .

N. Y. C 4H. R

N. Y. C. 4 H. R.

N. Y. C & H. R.

L. V. R R

4,300

. Hudaon. N. Y

fj

. . . Portlaad Poial, N. V

1£00