FE Fis te Og eS ee = ee 
a as ee 
ee ee ee a ee a ee ee ee 
ae ee en ee ee 
E. Loomis on vibrating Water-falls, 357 
the abutment on the east side of the river, the air flowed ina 
strong and steady breeze without pulsations, There was. a 
slight ens from the -northwest. Gauge 8 ft. 2% inches. 
April 16th, the sheet of water was tolerably smooth without 
aS lightest appearance of periodical vibrations. Gauge 7 ft, 
1 
Thus it will be seen that when the gauge indicated 4 ft. 93 
inches, the vibrations were becoming irregular; and when the 
water rose to 6 ft. 8 in. the vibrations ceased entirely. As this 
Reeth table presents a summary of all my observa- 
tions at Holyok 
Prof. Loomis’ observations at Holyoke. 
of vi- Depth of |N°- of Vil Temper- 
Date, rate bey ‘rat Tempe. || Date. wales : ropes - nine at 
boat Pe ite, | Water. by genes inute, | Water. 
, 16 —— 0 860, July 7) 28 inches. 135°4 
1861, July 30/14 “ | 257-0 | 734° 1861, Avs eg 47 81°6 | 434° 
“ July 31}145 “ | 256°6 1/483“ 812 
1860, July 10|16 “ | 954-9 A ani 502 « 80°8 | 43 
July 7 #@ | 949-9 | “ Apr.12/51¢ “ 80°9 
“ July 9)18 “ | 2560 " ae 54 80-0 
“ July 8i23 “ | 1844 | “ Apr. 13/574 18°6 
“ July 8|25 « | 134°8 || “ Apr.14|80_« 0 | 4s 
Mr. Joseph P. Buckland, a graduate of Yale College, who 
atte : Holyoke, has at my request made a series of observa- 
tions, of which the following is a summary. 
Date. |Deprt by gange.| Vibrations per I Date. [Depth by gauge. Kee 
1862 ft. a 18 ft." in. 
Sept. 22 1 10} 808 nearly. |/Sept. 10; 2 54 128 
* 91 10 | 288or 290 || “ 6 2 6 133 
ae re re 296 or 298 ie a ee 128 
Aug. 31} 2 0 280 eo gous 134 
Sept. 1] 2 0 280 4 ofbe Bo 133 
ene | 2 4 292 toe 2- St 133 
vee 2 2} 2738 = 3 2 103 130 
It will be perceived that my observations, for depths from 14 
to 18 inches, agree pretty well with Prof. Snell’s, as stated on page 
355; but Mr. Buckland differs ma terially from "both of us. No 
' four per second; and I am of opinion that Mr. Buckland has 
estimated the veloc for depths from 22 to 26 inches, con- 
sige ly too great. For oo a little greater than two feet, 
e all agree reasonably w 
ee must be considered i sufficiently established by these ob- 
Servations, that the sheet of water at Holyoke exhibits three 
