76 SEC. 3. MEASUREMENT. 



278. Chartometer, E. K. Morris's patent. (Silver medal 

 awarded at Manchester, 1875.) 



The Morris Patents Engineering Works, Birmingham. 



The only instrument that measures and registers distances on maps, plans, 

 scaled drawings, &c., and that is adapted for various scales. By guiding the 

 small steel wheel along any route on a map, the hand registers the actual dis- 

 tance in miles, yards, &c., according to the dial in use and the scale of the 

 map, which should correspond. To deal with a map of a difficult scale, the 

 glass front is opened by pressing a spring ; the dial removed, and another 

 corresponding to the fresh scale slipped into its place. A set of dials adapted 

 to the scales of all the Ordnance maps, and the usual scales of travelling 

 maps, &c., &c., is contained in a recess of the leather case, beneath the 

 instrument. 



277 a. Pedometer, of the latest and most approved form. 



J. and W. E. Archbutt, Westminster. 



This instrument has pendulum action, and is worn suspended in the waist- 

 coat pocket ; it is provided with a regulator whereby it can be set to accu- 

 rately record distances walked. 



277b. Improved form of Pedometer, by Dollond, in which 

 the direct chain action is substituted for the lever ; made in the 

 early part of the nineteenth century. 



J. and W. E. Archbutt, Westminster. 



277 c. Pedometer or instrument for accurately register- 

 ing distances walked. This instrument was invented and made 

 by Spencer and Perkins in the latter part of the eighteenth 

 century. /. and W. E. Archbutt, Westminster. 



290. Scale for Measuring Curves, Eschenauer's patent. 



Hermann Schafer, Darmstadt. 



The curve scale is intended for engineers, steam boiler makers, surveyors, 

 architects, and others, for copying maps, plans, &c. 



It will be of great advantage in the projection of railway lines, the 

 curve scale requiring only to be adjusted to the situation in order to ascer- 

 tain how the line can be most favourably traced, and expensive cuttings 

 avoided. In regard to such surveys, as well as in the control or examination 

 of railway lines already traced and sketched (for which purposes either the 

 curves, cut of certain radii, or compasses, are used at present), the employ- 

 ment of the curve scale will save the trouble of trial, since the correct one can 

 be immediately determined and read by means of this instrument. 



Boiler manufacturers, also, and almost all engaged in technical pursuits, will 

 find the curve scale very useful for determining the radius of an arc of a 

 circle, of which three points are given, as, for instance, in curved steam 

 boiler bottoms. 



In fact, in all cases where part of an arc of a circle, or three points of the 

 samei are given, the radius can be read direct, and without loss of time, in a 

 manner hitherto unknown. 



If it be desired to take the radius of a given curve by means of the scale, 

 the middle bar of the same is placed on the curve line, and the scale is then 



