1806.] 



Proceedings of Learned Societies. 



369 



been adjudged to Mr. Joseph Davis for 

 liis invention of a l)ay and JNight Teie- 

 eiaph. The day teiegraph woi-ks on a 

 I'njjenor principle to that at prefent in 

 ule ; it is not fo liable to get out uf order, 

 and facihtates the correfpoudence. The 

 iii;:ht telegraph can at any time be got 

 ready and fixed in a few minutes ; it ad- 

 uiits lights of any defcriptiun, hmple or 

 couipound, which are not lialjie to injury 

 from the weather ; tlie htuation in wliich 

 tiiey are placed with the line of direction 

 makes the night tele;;raph erjuaily ufeful 

 ^vith that for the day. Befoie the centre 

 lamp in the niiiht telegraph is a plane 

 convex, or double c -nvex lens of any 

 focus or diameter, formed lioUow fo as 

 to admit of being tilled with any tran'.'pa- 

 I'ent coloured liquor, to which lens tliere 

 iliuuid be a neck or tube, to admit of the 

 contraction or e.vpaniion of the coloured 

 h ^uor. The uiy,ht telegraph has 63 

 changes, without varying the line of di- 

 rection. The middle Ihutter of the day 

 telegraph works in grooves on each tide : it 

 is railed and lowered by a pole. If placed 

 in the centre, it forms with the ilx (butters 

 126 changes, and by being raifed ncca- 

 lionally on a line with the upper Ihutters, 

 or drawn down to the line with the lower 

 Ihutters, will form in the whole 25a 

 changes. It is portable, and may, when 

 not in aftiial work, be lowered within the' 

 boufe, , 



To Mr, Andrew Flint have been 

 voted lifty guineas for his invention of an 

 Expanding Band Wheel to Regulate die 

 Velocity of Marhincry. The ufual method 

 of connecting machinciy, is by a band run- 

 ning over two wlic-els or riggers ; hence 

 the relative velocity of the wheels is in 

 tJie inverle ratio of thf-ir diameters, aaid 

 tliele diameters always remaining the 

 •lame, no alteration of velocity can be ob- 

 tained, but by a correfponding variation 

 in that of the moving power applied. 

 By Mr. Flint's invention, the artizan is 

 enabled to regulate the velocity of his 

 .maciiinery at pleafure, the moving power 

 remaining ab before, or to retain the fame 

 motion with an alteration in that of the 

 wpplicd force, lie propofes two methods 

 • of attaip.ing this object : in both, the pc- 

 .ripljery of thfi! band-wheel is divided into 

 liny convenient number of parts, wljich 

 may be placed at any given diitance from 

 the centie of tiie wheel, and thus by en- 

 larging the circumference of one bund- 

 ,T\hcol, while the other is equally dinii- 

 niflied, to alter the relative velocity of 

 '<?ach at pleafure. 



MoyrjiL^ M.\c. No. 149. 



Mr. Salmon, of Woburn, obtained & 

 premmm and the lilver medal for an aH- 

 provemeut in Canal-locks, and for pre- 

 venting a wal'te of v\ater. 



To Mr. Hawkins alio was voted the 

 filver medal for an invention of a Ma- 

 chine for cutting Paper and the Ed^es of 

 Books, Oil tliree Glides at once dxmg m tha 

 I'rcfi. For this purpole, it is iiecelVarj 

 that the book be placed at one end, and 

 a fiipport give to the plough beyond tha 

 part cut ; there is, therefore, at each cor- 

 ner, a block moveable on the centre, fo 

 as to elongate alternately the hde or eud 

 of the prefs. 



The prefs is as wide as the intended 

 length of the book; at a diilance from 

 the end of it equal to the required width 

 of the book, is a flop, made fomewhat 

 like two combs, one faftened on each lide, 

 the teeth of one going into the interfticcs 

 of the otiier, fo that it may elfectually 

 prevent the book from falhiig too low, 

 whetiier the prels is open little or 

 much. 



la the common prefs, the book is put 

 in the middle, and there is a fcrew at 

 each end to force the prefs together ; but 

 ill this prefs, the book being put at ona 

 end, there is a fcrew about the middle to 

 force the prefs togetlier, and another 

 fcrew at the lower end to force it. 

 open, and confequently prefs the book 

 tighter, exa6tly on the principles of cabi- 

 net-makers' haiid-fcre\\s. '^ 



Fifteen guineas have been granted to 

 Sir. "Henry Ward of Blandibrd for a 

 New Striking-clock Movement. Th* 

 flriking part of this clock is fo far fimpli- 

 fied, that tlie \\hole train of wheels uled 

 in common clocks, together with the bar- 

 rel and weight, are entirely fuperfeded. 

 The povver neceffary for railing the ham- 

 mer is obtained from the pendulum. 

 The advantages of this clock are faid to 

 be (1) That it is not attended with 

 that difagreeable roarins; which is fre- 

 quently heard in the wheels and pinions 

 of others, and particulaily the fly-pivots 

 when in want of oil. (2. j That the inter- 

 val between the llrokes is unifoi-mly the 

 fame : the cafe is very different in other 

 clocks, for as they i;ct foul, they always 

 llrike flower, ancl the more fo Uill v.hcn 

 the weather is cold. (3.) In couiequence 

 of its fimplicity, it is not liable to be out 

 of repair : and (4) It can be manufac- 

 1 urcd for coyiiderably lefs expeiice. 



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VARIETIES, 



