for lEitigineering and other Purposes. 



33 



kinds of quantity, amongst others to the various measures 

 and weights, as the linear measures, the cubic measures and 

 measures of capacity, the superficial measures, and the weights 

 of all denominations and all countries, any two of a kind ad- 

 mitting of comparison after the manner explained with the 

 thermometer. The scales intended for drawing are gradu- 

 ated on separate slips of card, in order that they may be im- 

 mediately applied to the drawing and to curves without the 

 intervention of compasses, and at the same time the confusion 

 arising from crowding together several lines of graduations 

 on the same slip of wood or metal to avoid expense, is got 

 rid of. 



Card has been selected as the material from its economy, 

 its flexibility, the distinctness of the black lines (ruled upon 

 them in my new dividing engine,), the facility of writing or 

 printing upon the card the titles and explanations, &c., but 

 principally from the identity of material of the paper scales, 

 and of the drawing paper, they are in consequence affected 

 in the like degree by atmospheric influence, which has been 

 experimentally proved*. The different series are ruled on 

 cards of light colours for distinction. 



The purpose of the present instrument, however, being dif- 

 ferent, the card is glued on a thin mahogany board six inches 

 wide, so as to contain on one or both sides several lines of 

 graduations, beginning from one line or zero; and any two of 

 the scales may be readily compared, or the correspondence 



\ 



INDEX 



/I 



1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 n I 



^A.CUBIC'^^DS\ JiiiimTrriiiiiii 



11 /t" I \ all 



TTTi 1 1 1 1 1 1 1 I |-ijTTT7B. CuBic Febt, \ y 1 1 [ 1 1 1 1 1 1 1 j I [ 1 1 1 j 



6 



~i 1 1 l|I 1 I i I I ) 



1 1 1 1 1 1 1 1 1 1 r trrVrrry C.GoBlC LVCHES | 



50 000 U 



N 1 1 1 1 1 1 1 iri 1 1 1 1 M i/D. Spherical Ins.// i i i i i i i i rrnrri'rr 

 i I / ' 1 I I 



100 O OP X ^ .^ „ x,XT A'ooo 



rprjTjTjnrjTjTp \rf\mz'^. S UPER^.Yabds V' 1 ' I ' I ' I M ' 1 ' I ' 



l|l)l],llllllljimi|I^F.Sl7PER^EBETi 



=y G.SuPER^lNrCHE& 



• A New System, &c., pp. 1 — 9, and 43. 

 Phil. Mag. S.S. Vol. 13. No. 79. July 1838. 



D 



