(!aki';w. — On a Cum^iound Haiiimograyh. 1(11 



Au'i'. III. Dr.'irri/ilioii. of it ('Oiiipoiuul Scisvioyraplh. 

 .J5y W. Ai-x. (!aiii':\v. 



{licdd lirfnre the I'liUDiiopliiral. InrJiliitc of ('(inlerhnry, liil Nnvrnihrr, 



IH'XI. I 



'I'llM object, of UiiH H(!iHiii()j;fii,])li in (,o rcf^iHtor iui oxucl record ol 

 C)iii'Lli(|iiii,l<('H, (1,1/ wlial/ovct; Liiiio luul a,L wliiiLnvcr lui^'lo l/lioy iiiii,y 

 conic, l)oili liori/,oiil,n,Ily iiihI viifLiciilly, h,h well 11,11 Uio iiiiiiiiH!C 

 of wiiV(!H, Llicii' iiia}^iiil,iiil(;, (lir(!cl,ioii, imkI I,Ii(! oxiicli Liiiio of Llin 

 coiiiiiKtiKU'.iiioiit itiid L(!i'iiiiiiii,l,ioii of Llic diHUirhiuicc, in Iioiii'h, 

 iiiimiLcH, hccoikIh, luid fniclioiiH of B(3coii(Ih. To {^luii l,li(.nc 

 roflullH I havo iiiiiLcd a minihcr of Llio Hl-aiidard iiiMLiiiniciiLs of 

 tho prcHcnt dn-y into 0110 compacL inacliiiid, tdl working' I.(j- 

 getlier, and rocordinf^ on Hniokcd-^^daHH [jlidcH, all dcivcn ))y Uic 

 sanio a^^nnoy — clockwork. 



I will bof^in by doHcribing Uic ixuididinn H(!iHnio}^;rii,|)li 

 wbicli in lo bo UHod for niarktnf.^ Llio lioiir, (V,c., wlicn Mio din 

 turbancc takcH ])la(U!, and wlnrdi {^'ivcu a condcnficd r(!C(jrd 011 

 an alnioHL HLalionary |)laL(!. 



'J'lio frame of LlnH inadiino is ahoid, Mfl,. Hiii. Iiif^h by aboid, 

 KJin. wide, wiLli a fool, of aboiiL 'Jfl,. lOin. loiij^'. J''roni Uic Lop 

 ot UuH fraiiio dcHcwindH Uio [jcnduiiini lor 2fl,. (Jin., tcrniinat-in;^ 

 i>i a l(;n,d lin^' ^'.'/i"- '" diii.ni(!i,(!r, and I ,''„in. in lliickncHH a,nd 

 depth. TliiH will w(!if,di alxMil, lOlb. On ilio Lop of LliiH rin^ 

 in a ^laHH plalc, upon which workn a Hcrow, ciuricd by an ami 

 from tho framework, to give tluj fricticjn required to ntop tln! 

 pciiduliun from Hwin^^ing owiii^' to inertia. 'I'll rough the 

 centre of tho ring in a metal n^d with a conical hole in iLw 

 centre, in which workn the top end of the indicatcjr. The 

 indicator in a piece of Hteel wins working on a bearing at 'Jin. 

 from itH toj), and Oin. down it terminateH in a nlide to carry 

 a needle, which r(;HtH on a Hmoked-gliuiK jilate, and givcH r(!coi(I 

 magnilied three timcH. 



The b(!aring refernid to n,bove in com])oH(!(l (A two knifc- 

 edg<;H ])lac(!d in a piec(! of wcnjd, which croHHCH the frame 

 about 'Jin. below the ring of the penduhnn, on which nsHtu a 

 ring with two A-whapCid nichcH cut to niceive the knife-ecigcH. 

 Those are to prevfint the ring being carried off the knife-cjdgcjs 

 in an eartlupiake. AiK^ther pair(jf knif(j-edgeH are fantened on 

 to the indicator, and rent in V-Hhap(!d nicliew in the ring a,L 

 right-anglcH to the knife-(!dg(!H und(;r the ring. 



Jt will bo seen by thin thiU, tin; record on the glaHH will be 

 drawn in the oppoHite dinicLion to tlu! movfiment of tho 

 priiiduliim. 



