on the Strength of Materials. 165 
April 23, 1817. Experiments on Cubes of 4 of an Inch taken 
from the Block. 
Averages. Ibs. avoirdupoise. 
4X4 ee 10561 
wor J 4XG : sis 9596 
(una Bee: 9917 
ee 9020 
Castings, Hortdonber: Specific Gravity 7:113. 
ix nA as ola mes 104382 
ix2 me mo ie: ata 10720 
oie ee ae i "10605 
1x i s ut 8699 
Vertical Castings. "Specie asics y 7074. 
+ x1 bottom of vertical bar a 12665 
ixi pbs aH oY $e 10950 
75 Re at ge a \ 11088 
ae sit, lke iiag acc Bite eseed 1HAB4d 
| 4x4 full size. Scale broke with 10294 ; 
L tried again its 11006 
A prism, having a Toganithmie curve for its limits, re- 
sembling a column; it was } of an inch diameter by one 
inch long, broke with .. -. 6954 
April 28th. Trials on Prisms f d sie 7 Lengths. 
xi horizontal .. _ oe 9455 
ae ate 1 ditto oe oar 
ix i ditto, bad taal, 9006 Ibs. 
xt vertical ds 3 2% 9938 
vaae's fi x1 ditto i ‘10027 
sete 29th. Hor ne ace 
aXe fe 9006 
4X@ Per 1s OA 
1x - ss 8362 
ixz ee oe aie a 6430 
; x# or one inch long ee ee 6321 
Vertical Castings. 
4 Xx ee ie mi 4h 9328 
+X 5 st ay Hy .. 8385 
; x4 asmall defect in the specimen .. 7896 
i x 5 rf on > aie ee 70S 
ix oroneinch .. Se aa 6430* 
Ex- 
* In these experiments the results are so irregular that no practical con- 
clusions ean be derived from them. There are mi wy circumstances that 
affect the results of such experiments, which were observed by Gauthey; 
L$ such 
