30 



MR THOMAS STEVENSON ON THE FORCE OF THE 



heio-ht of spray, &c. were generally kept; but it was not considered necessaiy to 

 complicate the Tables by inserting these, excepting in one or two instances. 



Dates. 



lbs. to a 

 Square Foot. 



Dates. 



lbs. to a 

 Squarf Foot. 



Observations at Little Ross. 



Dates. 



lbs. to a 

 .S(|iiarePoot, 



1844. 

 Feb. 



The Observations at the Skerryrore Rock, and 

 the neighbouring Island of T>Tee, distant 13 miles 

 from the Skerryvore, are as follows : — 



1843. 

 April 24 



May 



June 



July 



20 



7 

 11 



12 

 16 



20 



3 

 4 



7 

 8 

 9 

 2 



3 



30 



455 



707 



243 



182 



243 



364 



(495 



1476 



182 



519 



428 



855 



173 



476 



(723 



\866 



433 



1843. 



Aug. 9 



... 22 



... 30 



5 



21 



5 



6 



18 



19 



27 



29 



5 



14 

 26 



Sept. 

 Oct. 



Nov. 



Dec. 



346 

 723 



389 



866 



9.i2 

 1.535 

 1606 

 1711 

 1497 

 1497 

 2353 

 2674 

 (3421 

 \At least 

 2460 

 1947 



In January, two instruments were placed beside 

 each other, but not set parallel. These instruments 

 had springs of different power, the one being about 

 double that of the other, and one had a disc of 3 

 inches diameter, the other 6 inches. 



Both instruments set parallel. 

 1844. I II 1844. I 



Jan. 16 428 Jan. 16 



427 



Another instrument was placed beside them, but 

 the two marked thus * were found to be too weak, as 

 the leathers were found flattened, and one of the 

 instruments was broken, and was not repaired till 

 the 15th February. 



3 



'.'.'. 13 

 ... 15 



'.'.'. 16 



... 24 



'.'.'. 26 



'.'.'. 27 



March 4 



'.'.'. "i 



... 10 



... 11 



... 12 

 ... 13 



10 



11 



12 



14 

 16 



17 



i's 



April 



429 

 457 

 214 

 228 

 321 

 280 

 321 

 428 

 402 

 343 

 1284 

 1364 

 685 

 2032 

 2086 

 399 

 321 

 321 

 342 

 3316 

 3369 

 3427 

 1069 

 963 

 913 

 1925 

 1925 

 1713 

 535 

 481 

 456 

 3316 

 4011 

 2970 

 1142 

 1283 

 1283 

 457 

 428 

 481 

 800 

 343 

 321 

 571 

 535 

 571 

 642 

 481 

 800 

 856 

 962 

 571 

 481 



Dates. 



lbs. to a 

 Square Foot. 



1844. 

 April 19 



22 



24 



25 



27 



•••{ 



30 



Oct. 



20 

 23 

 25 

 30 

 2 



3 

 4 

 11 

 14 

 19 

 20 



800 



535 



481 



913 



428 



962 

 1942 

 1604 

 1370 

 1283 



343 



321 



457 



481 



642 



229 



241 



343 



481 



571 



1828 



1028 



457 



914 



1533 



571 



971 



457 



1142 



286 



914 



1028 



571 



914 



914 



914 



800 



1713 



1028 



914 



457 



1142 



685 



1599 



2399 



1485 



1828 



3427' 



1699 



1599 



2513 



' On this occasion, 14 stones were slightly moved, and 14 scattered, all of which had been built into the 

 round-head or end of Hynish Pier, which was still in an unfinished state, and a Dynamometer which was 

 attached to the Pier, registered on this occasion 2557 lb. These stones weighed from 1 to 1 !■ tons, and ex- 

 posed, when built into the wall, about 2 square feet of surface. The stone to which the instrumcBt was fixed 

 wa^ turned upside down, although it weighed about li ton z^ 2800 lb. 



