THE ISOSEISTS. 327 



Of overthrown bodies recorded by Mr. Pascoe we have a certain 



number from which a limiting high value for v may- 

 Projected bodies. IT! • -.1-111 



be deduced Jbrom projected brick globes on the 

 Town Hall, Lahore, in its higher part, we have a horizontal distance of 

 32 feet and a vertical one of 67 feet which gives i<=16 feet per second. 

 From those on the lower part of the same building we have horizonta 1 

 projections of 17 and 15 feet respectively, from a height of 56 feet which 

 gives values for v = 9 and 8 feet per second respectively. Other calcula- 

 tions made by Mr. Pascoe are, for Lahore — iron flag on railway station 

 roof v = 6% feet per second, cupolas of Golden Mosque v=6'91 and 535 

 feet per second, and for Sialkot, cross from steeple of church 169 feet 

 high »== 12*7 feet per second, v representing in all these cases the maxi- 

 mum horizontal velocity with which they were projected from their high 

 positions. Mr. Pascoe comments on the fact that of several tall factory 

 chimneys near the railway line at Lahore none had fallen. The same 

 immunity was also remarked by me with respect to the Dhariwal mill 

 chimneys. 



With the IV — V area we arrive in the region of no damage at all, 

 Character of the not even cracks, except in a few cases of particularly 

 , — aiea. dilapidated and ancient edifices. There is small 

 wonder at this when we consider the enormously extended front of the 

 surface wave over which all the energy of the original seismic distur- 

 bance has now to be distributed. That known surface front at the IV — 

 V isoseist is about 1,200 miles, and there must have been a front equally 

 long on the Tibetan side of the seismic area. It is also the region of no 

 overturned objects, and also where panic in the case of the able-bodied 

 is almost conspicuous by its absence. It is primarily the area 

 of tremulous vibrations which nevertheless in many cases are btill differ- 

 entiated into preliminary tremors, main shock and end tremors. It is 

 the area of rocking beds—" like a dog under the bed " and swinging 

 punkahs, and rattling doors and windows. Occasionally trees are stated 

 still to rock and a rolling motion of the ground is still felt but not so 

 markedly as in the VI — VII area. One observer has described the sen- 

 sation as that oi a swing going dead slow. The sound is of the usual 



