A452 Mr. Henwood on the Rocks and Veins 
tion, we assume its extent in each case to be equal to the pro- 
duction of the observed results, it will be as follows :— 
Depth. Extent of elevation. 
Richards’s lode... 13 fms... ... . 17°5 fms. 
Pressure'S.dode’. $3 ise. 2 he INR 
oes fie MABO ee OLA ORDO 
on el DSO OR Oe 
on PU its ]o hi arr we MeN Wy: fal (ae A 
Pressute Nudode. 2188. 6 Os). SEO PERE 
were oe eS eeen hielo lee eee GhO tae 
Bissa lode ft BAB eM, he es 17S Se 
Bor lode owas FO eh 2). meter hea rrpetgiie s 
oA os) « FOB ey fetter thors ‘E°OM ees 
con a OOS ee Mi Ee Sere ® baa 
eee Ho) BOB RE eh Het. ee eee : 
The differences here are certainly not less than in the first 
series of comparisons. 
Let us still preserve the direction of the movement, but see 
the varying extents of it requisite to produce heaves of the 
same magnitude at all the points of observation. Let the ex- 
tent of the heave be taken at 42 feet, which is about the mean 
in this mine :— 
Depth. Extent of elevation. 
Richards’s lode. .. 138 fms. ....... 17°5 fms. 
Pressure/SJlode? i188 sie 2 ek EP TM 
eee Sea wade eee ee @ 
Ss 
2 
S 
eve a aWCeHS Melts oeee @ @ 
— 
2S 
o 
Pressure Ne lode «| 20387... %O SV eh ae ee 
eee yal oOo eee ie Petre stat a Je OSI chie 
Bissa lode gree ABM ee SCR me Cie, ae 
Bor lode ae et AO cet a! gee Coe em meee 
ae Wie eNO Diesel” otemeiderte tao, LT eoimene 
ee Sires OS eeu’ hc ete se rete? LAOmres 
oe LOD ees.) 2 eden ete patna) eon 
At Polberrow (i) and the United Mines (m) similar differ- 
ences occur. 
The number of examples in which several veins are inter- 
sected by the same cross-vein is but few ; in all of them, how- 
ever, it will be found that no motion in one direction, and of 
the same extent, will restore the continuity of every vein so 
intersected :—and I must here repeat, that the difficulty is in 
the connexion which subsists between them. 
(4.) A curvilinear motion is the only one now remaining 
for comparison with the facts observed. In order to ascertain 
