Slides with colored maps and colored bars would be used as fillers, to be kept on the screen continuously whenever there were no telegraphic reports to be projected on the screen in written words. It would probably be found desirable, in many cases, to show telegraphic reports in such manner that a map would be thrown on the screen between each two telegraphic reports, and also held on the screen whenever telegraphic reports should not come in fast enough.

Election returns are sometimes told to a whole city by search lights thrown from the top of some high building. National, State, or municipal election returns can be kept distinct by the search-light method if certain directions, north, east, south, or west are announced for the lantern beams referring to the different kinds of election returns. Until complete reports have been received the lantern beams can be moved gradually up and down. After complete reports are in the beam can be held steady, so that the watchers even miles away may know from the angle of the light and its position that a conclusion has been reached, and who wins.

Educational material shown in parades gives an effective way for reaching vast numbers of people. Fig. 238 illustrates some of the floats used in presenting statistical information in the municipal parade by

GENERAL METHODS

l-'holo by the l7U':rnatio?ial News Service

Fig. 238. Statistical Exhibits in the Municipal Parade by the Employees of the City

of New York, May 17, 1913

Many very large charts, curves and other statistical displays were mounted on wagons in such manner that interpretation was possible from either side of the street. The Health Department, in particular, made excellent use of graphic methods, showing in most convincing manner how the death rate is being reduced by modern methods of sanitation and nursing