Where several cuctomers are In one town or city hulldlne. alternate lar>;e and small heads are |ille<l on a lont; |iln. Sec Illustration (li).

Serlies 34.150

Glass Head Pins

Series Celluloid Tacki

Pins and Tacks with Writinit Surface. Rough surface claits head pins and roii(?h surface celluloid lacks are convenient because you can write data on them with pencil or with India Ink. Pencil can be erased with ordinary erasers and Ink washed off with water and a little soap, so that pins can be iLsed acaln and again.

Educatiotial Exhibition Co., Providence, Rhode Island.

Map Marking Devices.

1. A very effective method of using beads is to string them either on a long pin or on a

drill rod of small diameter, and then place them upright on a map. See 192B. In selecting drill rods, the largest size that will go through the hole of the bead should be chosen. Beads for this purpose may be obtained at any variety store.

2. Beads on pins have been used very effectively on a map showing intended civic improvements. Red beads indicated assessed valuations on buildings, while green represented assessed valuations on land. Each bead represented a certain number of dollars and each pin represented an individual property. The wide adaptability of this material is evident.

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Chapter 23 MAPS WITH CIRCLES AND SECTOR CHARTS

THE chief advantage of placing circles and sector charts on maps is that the geographic location of the information is given. The general rules for sector charts in Chapter 9 may be followed here also.