Trnnntion Studiex 



87 



printed odIv in two column, ii;<l outline for England and black shading for 

 niin and cloudiness. It is entitled: " Knglish \V i-ntlier l)aUi, Feb. 9, 1861, 

 1) h. am.," and is part of a circular isstie*! from 4'J Rutland (iate and dated 

 .June 12, 18G1. " The accompanying sheet lias U'en printe<l as an exjwriment, 

 by means of movable types vvbicb 1 have had cast for meteorologiail pur- 

 poses." To save confusion of figures, barometric heights were not inserted 

 on the map, but lines of etpial pres.sure having l)een deduced, the places where 

 the isobars of each ^ of an inch cut the right- and left-hand borders of the 

 map were marked, and a straight line joining any pair of corresponding 

 figures was taken to lie approximately the corresponding isobar. These isobars 

 were not given on the map'. 



In July 18G1 Galton issued another circular, this time addressed to 

 European meteorologists and printed in English, French and German'. He 

 appeals to them to provi<le synchronous meteorological data for a series of 

 aerial charts of Northern Europe (latitudes, 42° 25 on the south, including 

 all France and Perugia, to 61° on the north, including Shetland, Bergen and 

 Christiania; from the westernmost limit of the British Isles to Konigsberg, 

 Warsaw and Budapest). The data were to be for the whole month of 



have survived. Wlicn the proper stampH have lieen attached the map is ready for photography 

 or ciigniving. I do not know why Galton i-eplaced these circular .stAuips by the oblong blocks 

 of Ills later maps, possibly l)ecau.st! the oblon^fs were easier to set up in a press and actually 

 print on to the map. This; map look.s more graceful than those of the circulars, but contains 

 somewhat Ics-s information. Tho two maps can be conipari'd in tin- iiccoiiifmnving plates. 



Specimens of Onltou's circular stamps for attaching to maps sad 

 so forminR synchronous weather chart!). See footnote 3, p. 36. 



This circular almost in the same words appears as an article entitled "Meteorological 

 Charts" in the I'hilosophkal Mayasinr, Vol. x.Xli, 1861, pp. 34—5. 



' This is, I l)elievc, Galton 's tirst appeal by circular for the tilling in of schedules, a practice 

 considerably developed by him later. 



