A Letter from Maurice Johnson Esq; President of the Gentlemens Society at Spalding, toJames Jurin M. D. Fellow of the Royal College of Physicians, London, and F. R. S. concerninga Metalline Thermometer, in the Museum of That SocietyAuthor(s): Maurice JohnsonSource: Philosophical Transactions (1683-1775), Vol. 45 (1748), pp. 128-130Published by: The Royal SocietyStable URL: http://www.jstor.org/stable/104521 .

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VI. X Leer from Mallrice Johnfon EJ*q; Pref1dent of whe Gentlenlens Society at Spalding, to James Jurin M. D. Fellow of the Royal College of P:zyficians, London, and F. R. S. concernio1g a Mctalline Ther- morncter, izt the MuSeum of that Society.

- S I R, SpaZdings yan. 16. t747-8. 2t.d Jan. 28. \ S I kllow it mufl gize you Plearure?

'' At ' 5 and, bcing by you (as I deFrc it maS

tre at tlleil next McetilzC ) .ommunicated to tlle Rotal Society, mav be of folne Credit to tllc Mc- lzlory of tlle Insentor tlle late Mr. Samgel Frotter- sngJ:aw a Grazicr at IXolbearh in Elloe Holla7nd} Lir;ro;/7zy2pireX and of folllc Profit to tlue NIaker, Disc

.

nlc _eas c to acquaitlt ) ou, tllat he (>\Ir. 70Dn Ingrams of this Piawe, \R'atc'.w-malarcr al-d \\'hitc-$mitha wllefc Father} origilzallt a I31ack-Slllitll at Cvt3>bztt, and Instentor of thc Alachinc for cuttin,? \XratcEl-\\hccl<} utas a,fio a moft accurate Artinckr) haxing made} atld at ms; InRance fonrc tin1c fince, fixed up in OUI ltIz*fm, a .N^letal Thermometer, which sve, oll Ex- periencc and ObfcrvationX found to anfs^?er and ge truly, I propoScd to the Company at our laR lMcet in;, in rlDecember, tht our Socaety (hould purchafe it llinl, I fclld you, Sir, his Def.ription thercof, as etlter'd from his Mouth in our I\zIinutes, which I truR may bc aDrecable to you, and the xYorthy Alembcrs of that IiluIrrious 130dxr, for xvhicll sre Xlcre llasc tne hi;heLt Honour: And tllourh Mr.

Berxd.ge

[ I28 3

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[ t29 ] Berie (fome timeaWatch-maker at Bofan) under the fame Inventor's DireEtion> made arld carried Sup to Town a Machin;e fomewhat of this fort, which Meveral of your Members may 11ave feen, yet I truPt thisS Account may not be unacceptable. I am

roacr mof edionate hgmbZe Servant,

M. JohnSon

X S)eivriptian of the hIetal Thermometer in the MuSeum of the GeSe-mens SocietyE t Spalding in LincolnShire

tT is compoSed o£ an upright Staff or Bar (a) of 1 the be Iron, four Fect 1ow, and an Inch and a Quarter broad, havirug a poliffi'd.braSs ..B.ar of the fame Length and Width. fcrew'd to it before its with four Stecl Screws, artd being alfo capp'd (6) wtth Steel, and thereon a L¢ver (c) moving upon a Stud of Steel, which communicates with another leSi; I:ever (d) (alfo upon a Stud) having a Chain (e) at the End of it, nvhichlaps round anSwis (f), whereto the Index is fixedj which {hews the Detrees marked on a femicircular Arch tg3 : Under the Steei Screw- Eleads there are fmall Slits in the BraSs Bar (excepe the loxYermoLt xvhich is fixed) svhich admit of its expanding, svhereby it protrudes and operates on tlle fir-mention'd Lever, which being raifed moves the lefs Len er, and thereby draws the Chain which turns the Axis aflixed to the Index} which-5ews the

R Dcgree

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c I:p g Degree of Wartn-th of the WVeather :marked w ffle f-rmicircular Arch. At (h) is a Screw- thro' two Studs, to draw the great Leverebackwards and for wards, as Occafions nzay be) (i) is a Counter-balantce ro the f£rall Ibevcr to -draw th.e Han*d bacl>when the I3rafs Bar 5rinks. -See the Figure pruJzxed in the TAB.

In the Beginning of the Year t735, I invented, ard cauSed to be confiruded, a Thermometer on the fame Principiles as this: I bund that a Rod of Brafs t Feet lprg svas fen£ibly aieEted by th: Changes of Heat of the teather, halring one expofed rn ti.y Gar derl during the hard Froft of tKhe U[iter 1739 and o.. AXd-my Inftrument was very renfible with either a BraEs R;od or an Iron Rodn when the Bottom of it was placed in a Sand-tIeatsfor che-mi- ca] UlEs; but I {hall refer the Reader to the Appendias to the pre- cecSing N°.p.67z. Breqf whereipiIhgyv gpvan, a fu-61 A0cr.iptiQn of my Inventions andithe ReafonJ why I did not publi{h it befor¢, tho>* I have lhewn the Inflrument: to>Scores of People elrer Elic;e May x735. and fent a Oefcription and Draught of it to M. Bu«on Super- intendant of the Royal PhyJ4ck GatQen at Paris tn the Year r744 in order for his layinz it before the Royal Scademy of Sciences at Paris, from which Iiad fome time befovereceived a DipSoma upon having the Honour of being appointed olie of their CorreJ ponding Members.

ct MortimgrO

.

E R RS fX

Pvge t. 1.9. fiGr Febr. I4. readJan.7and I4. P.27t in the Colunln expreffisng the Nutation,

I7o9. Sept.8. for -6.9 read-6.4 X 730^ Sept. S. for -3 4 read _ 3.

c I:p g Degree of Wartn-th of the WVeather :marked w ffle f-rmicircular Arch. At (h) is a Screw- thro' two Studs, to draw the great Leverebackwards and for wards, as Occafions nzay be) (i) is a Counter-balantce ro the f£rall Ibevcr to -draw th.e Han*d bacl>when the I3rafs Bar 5rinks. -See the Figure pruJzxed in the TAB.

In the Beginning of the Year t735, I invented, ard cauSed to be confiruded, a Thermometer on the fame Principiles as this: I bund that a Rod of Brafs t Feet lprg svas fen£ibly aieEted by th: Changes of Heat of the teather, halring one expofed rn ti.y Gar derl during the hard Froft of tKhe U[iter 1739 and o.. AXd-my Inftrument was very renfible with either a BraEs R;od or an Iron Rodn when the Bottom of it was placed in a Sand-tIeatsfor che-mi- ca] UlEs; but I {hall refer the Reader to the Appendias to the pre- cecSing N°.p.67z. Breqf whereipiIhgyv gpvan, a fu-61 A0cr.iptiQn of my Inventions andithe ReafonJ why I did not publi{h it befor¢, tho>* I have lhewn the Inflrument: to>Scores of People elrer Elic;e May x735. and fent a Oefcription and Draught of it to M. Bu«on Super- intendant of the Royal PhyJ4ck GatQen at Paris tn the Year r744 in order for his layinz it before the Royal Scademy of Sciences at Paris, from which Iiad fome time befovereceived a DipSoma upon having the Honour of being appointed olie of their CorreJ ponding Members.

ct MortimgrO

.

E R RS fX

Pvge t. 1.9. fiGr Febr. I4. readJan.7and I4. P.27t in the Colunln expreffisng the Nutation,

I7o9. Sept.8. for -6.9 read-6.4 X 730^ Sept. S. for -3 4 read _ 3.

This content downloaded from 193.105.154.10 on Wed, 14 May 2014 23:37:37 PMAll use subject to JSTOR Terms and Conditions