480 



Major-Gfrifral RoY*s Jccount of the Meafurmmt of a Safe on Houiiflow-Heath. 



Table of the Expantions of Metals, deduced from experiments made with the Microfcoplc Pyrometer In April 1785. 



DLrcriptioii of tlie Metal Rods put to experimciiL 



Revoluiionsand 

 partj of the 

 micromi;Cerfor 

 the expanfion 

 on five tcct. 



Standard brafs 

 Icale. 



Englifh phte 

 brafs, inform 

 of a rod. 



EnglKh plate 

 brafs, in form 

 of a trough, 



Steel rod. 



Caft iron 

 prifm. 



Glafs tube. 



Solid glafs rod, 



r Suppofcd to be Hamburgii pJatc brafs ; length " 



I 4'. 187 inches, or 3.568 ftet; breadth 0.55 



J inc!i ; thicknefs 0.25 inch; and wcii;Iit i lb. 



ir ! 07.. Its expanfion was mcafured by :;5.+7 



revolutions of the micromttcr, wherefore that 



on five tcct would have been mcafured by - 



Length five feet, breadth 0.9 inch; thick-' 

 nefs 015 inch i and weight 2 lbs. 5I oz. 

 Difficult troni its thinnefs to be kept free from 

 warpmg, - . _ 



Length five feet; breadJi 1.4 inch; depth I - 



inch , weight 8 lbs. 3 oz. Perfcdly ftrongand I 



•ftraight, - _ _ J 



{Length five feet; breadth 0.5 inch ; thicknefs ^ 

 0.3 inch ; weight 2 lbs. ■]{ 02. Made from the ' 

 very fame bar wiih the chain, ~ - J 



{Length five feet , eath of its fides il inch ; -^ 

 and weight 11 lbs. 9 oz Cut from the fame 

 rod with the ftandard prifms of the pyrometer, J 

 {Length five feet. yV^ths inch diameter i^ 

 weight I lb. 13I 07,. Drawn from the fame ' 

 p6t of metal with the mcafuringrods, - J 

 ILcngth40.44incK£S,or3.37feet; mean dia-*) 

 merer fix-tenths of an inch ; and weight i ]b. ' 

 2 07,. Jl had been applied for fcvcral years to a [ 

 clock. Its expanfion was mcafured by 10.46 [ 

 revolutions of th-* micrometer ; wherefore that i 

 ton five feet would have been meafured by - J 



Hyi8o°|By i' 



lUv.Pts. Parts. 



35-69 



36.41 



36.45 

 22.02 

 21.34 

 ^•93 



'554 



I2.AV 



Aftual expanfion in parts of an 

 inch by i8o% the rcvoiutions 

 being divided by 32.06. 



On 5 feet 



On r foot, 



In. 



0,111323 



0.11356S 



0.1 1 3693 



0.068684 

 0.066563 

 0.046569 



0.048472 



0.0222646 



0.0227136 



0.0227386 

 0.0137368 

 0.0133126 

 0.0093138 



0.0096944 



On 100 ft. 



2.22646 



2.27136 



2.27386 

 1.37368 

 1.33126 

 0.93138 



0^6944 



i" of Fahrenheit the expanfion is 



On I foot. 



0.0001237 



0.0001262 



0.0001263 

 0.0000763 

 0.0000740 

 00000517 



0.0000539 



10 feet. 



0.001237 



0.001262 



0.001263 

 0.000763 

 0.000740 

 0.000517 



0.000539 



xoo feet. 400 feet. 600 feet- 



In. 



In. 



In. 



0,01237 0.04948 0.07422 



0.01262 



0.01263 

 0.00763 

 0.00740 



0.Q05 1 7 



0,00530 



0.05048 



0.05052 

 0.03052 



0.02960 

 0.02068 



0.02156 



0.07572 



0.07578 

 0.04578 

 0.04440 

 003102 



0.03234 



lOOO ft 



In. 

 0.1237 



0.1262 



0.1263 

 0.0763 

 0.0740 



0.0517 



0.0539 



Bafcs of 



17400 feet of tUefe mcta 

 would expand. 



By I , 



3'38938 



3.45788 



3,46062 

 2.09062 

 2.02760 

 1.41658 



1.47686 



By lo'". 



In. 



33-8938 



34.5788 



34.6062 

 20.9062 

 20.2760 

 14.1658 



14.7686 



67.7876 



69.1576 



69,2124 

 41.8124 

 40.5520 

 2?.33i6 



29.5372 



In. "~ 



101,6814 



103.816S 



60.828c 

 42-49;4 



44-30j! f 



i 



