306 FHILOSOPHICAL TRANSACTIONS. j^ANNO 1739. 



Hence it appears, that the calculations from the above theory agrees so 

 well with Mariotte's experiments, of the height to which the jets rise ; 

 as also with Poleni's measure of the effluent water ; and with the diame- 

 ter of the contracted vein, measured by Newton and Poleni, that it can hardly 

 be doubted that the above theory is either true, or at least very near the 

 truth. 



A Collection of the Observations of the Eclipse of the Sun, August 4, i738, which 



were sent to the Royal Society. N° 453, p. Ql. 

 By Mr. George Graham and Mr. Short, FF. R. S. at Mr. Graham's home 

 in Fleet-street, London, by a Refracting Telescope of \2 feet focus, armed 

 with a Micrometer, and by a Reflecting Telescope ofQ inches focal length, 

 p. 91. 



Beginning of the eclipse at 9'' 59"" 20' A. M. 



End at 11 59 36 



Duration 3 O \6 



Quantity of obscuration by the micrometer 2 dig. 28. min. 



2. At Upsal, by M. Celsius, F.R.S, with a 7-foot tube, and a Graham's Mi- 

 crometer, p. 92. 



12** 18"" 52' ... . True time. Beginning of the eclipse. 

 12 42 22 ... . The end. 

 O 23 30 ... . The duration. 



3. At Wittemberg, by J. F. fVeidler, F.R.S. p. g'i. 

 The beginning could not be seen for clouds. 



At 1 1*" 30™ increasing, 1 digit, eclipsed. 

 12 19 2 dig, 30' eclipsed. 



4. At Bononia, by S. Manfredi, F.R.S. &c. p. 94. 

 At 23'' O" 10" eclipsed, 1 digit. 



3 o the middle ; 4^ digits. 



1 18 1 the end of the eclipse. 



Some Electrical Experiments, chiefly respecting the Repulsive Force of Electrical 

 Bodies.— By Granvile Wlieler, Esq. F.R.S. N" 453, p. 98. 



The following experiments were made in the autumn of the year 1732, and 

 repeated to Mr. Grey the following summer. 



