CONTENTS. iU 



XVI. A New, Cheap and Simple Apparatus for repeating tlie Hours and 

 Quarters in Clocks aAd Watches. By Mr. J. M, Elliot. Communicated 

 by the Inventor. --_>.- 157 



Scjentific News, 159. — Prize for the artificial Compofition of Palladium. ib, 

 Prize adjudged at the laft Public Meeting of the National Inftitute, ib.— 

 Teyierian Society at Haarlemj 1 60. 



MARCH, 1804. 



Engravings of the following Objefts : 1. A new Steam DIgefter, In which the 

 Heat and Preflure are rendered ftationary, by Sir A. N. Edelcrantz ; 2. A 

 Pelign exhibiting fome remarkable Strata of Flint, by Sir Henry Charles 

 Englefield, Bart. F. R. S. 3. A mercurial Air- Pump of unlimited cxhaufting 

 Power, by Sir A. N. Edelcrantz ; 4. Sketch of the Occultation of a Fixed 

 Star by the Planet Mars, obferved by Sir Henry Charles Englefield, Bart. 

 F. R. S.J 5. Figure to illuftrate Dr. Herfcheirs Theory of the Changes in 

 the Situation cf Double Stars. 



J. Defcription of a new Steam Digefter for Philofophlcal Refearches. By Sir 

 A' N. Edelcrantz, Counfellor of the Chancery, and private Secretary to th« 

 Kirg of Sweden i Member of the Swredi/h Academy, &c. &c. Communicated 

 by the Author. - . - - _ 1^^ 



II. Inveft gation of certain Theorems relating to the Figure of the Earth. By- 

 John Pjayfair, F. R. S. Edin. and Prof e (for of Mathematics in the Univerfity 

 of iidinburgh' . - - - - - 167 



III. Enquiries concerning the Nature of a Metallic Suhftance lately fold In Lon- 

 don as a new Metal under the Title of Palladium. By R. Chenevix, Efq. 176 



IV. Obfervations on fome remarkable Strata of Flint in a Chalk-Pit in the 

 Ifle of Wight, in a Letter from Sir H, C. Englefield, Bart. F. R. S. to J. 

 Latham, M..D. F. R. S. and L. S. - - - 183 



V.Deicription of a mercurial Air-pump, of unlimited exhaufting power, with a 

 Wooden Pi (Ion, wo'king in a Wooden Cylinder, &c. By- Sir A. N. Edel- 

 crantz, &c. &c. Conmiunicated by the Author. - - 188 



VI. O.n the Combinations for fupplying Worm Tubs with Cold Water, by the 

 Syphon, with an caly Method of fecuririg the Joints of fuch Hydraulic Ap- 

 paratus again ft the AdmifTion of the External Air. In a Letter from Mr. 

 William Cloie. -. - - - - 191 



Vlli An Anfwer to Dr. Wollafton's Statement, " Of an Improvement In the 

 EoYfri, of Spedtacle-Glafles." By Mr. W. Jones, F. Am. P. S. Optician, 



. Holborn. - - - - . 192 



VI II. An Account of an Occultation of b Nebulae Sagittaril, by the Planet 

 • Mars, on the 17th of April 1796, obferved by Sir Henry Englefield, Bart. 



F. R. S. In a Letter addrelTed to the Rev. Ncvil Maikelyne, D. D. F. R. S. 

 and Aftrononier Royal. - - - - 193 



IX. Letter from Mr. Ezekiel Walker, containing a confiderable Improvement 

 in Time-Pieces, by Mr. Berraud, with Remarks. - - 205 



X. Letter from C. Wilkinfon, Efq. containing Fads upon which Deduftions 

 are made to (liew the Law of Galvanifm in burning the Metals, according to the 

 DifpolUion of equal Surfaces of charged Metallic Plate. . 2OS 



XI. Account of the Changes that have happened, during the laft Twenty-five 

 Years, m the relative Situation of Double- ftars ; with an Inveftigation of 

 the Caufe to which they are owing. By William Herfchel, LL. D. F. R. S. 

 From the Philofophical Tranfadions for 1803. - - 210 



Xn. On the Nature of the Varieties of Engrafted Fruit-Trees, with a Plan 

 for increafing the Number of New valuable Fruits. By T. S. Dyot Buck- 

 nal, Elq. M. P. " " . " . " " 227 



Xin. Explanation of the Subje6>s concerning which Queftions were propofed 

 at Page 71 of the prefent Volume} namely, 1. The place of the Ereft 

 Image behind a Concave Speculum ; 2. Of the Image formed by a Concavo 

 Convex Mirror, which is not Left-handed, and has the Property of re- 

 volving along with the Mirror; and 3. The Figure of the Sky. By W. N. 236 



Uieful Notices refpefting various Objefts. By a Correfpondent, 240.— Cotton in 

 Inks ib«— Shaving with Water, ib, 



APRIL. 



