II. LENGTH. 75 



indicate on dials the distance passed over and the fare. There is also an 

 appliance for registering on a slip of paper all the fares taken during the day. 

 The pointers can be brought back to zero by the driver, but they cannot be 

 moved forward except by the motion of the vehicle. 



240. Improved Measuring Wheel or Mile Meter. 



Elliott Brothers. 



24Oa. Micrometrical Divisions in English and Metric 

 Measure. Dumoulin Froment, Paris. 



27O. Holt's Diagr ammeter. This instrument is specially 

 made for measuring the ordinates of indicator-diagrams 6" long, 

 and is used much after the manner of a parallel rule, the register- 

 ing nut on the screw being first placed at zero ; when it is required 

 to register a measurement the break key is depressed, and when 

 all the measurements have been taken the distance the nut has 

 travelled gives the mean ordinate. Henry P. Holt. 



274. Spherometer (by Salleron), to read to *001 mm. 



The Council of the Yorkshire College of Science, Leeds. 



276. The Wealemefna, E. R. Morris's patent. A pendant 

 for the watch-chain. 



The Morris Patents Engineering fVorks, Birmingham. 



To measure, it is merely necessary to advance the Wealemefna over the 

 object, when the large hand will register the inches and fractions of an inch, 

 and the small one the feet. The instrument registers to 25 feet. 



276a. Schlagenheit's Measurer for Curved and Straight 

 Lines. S. J. Hawkins. 



This instrument has a small wheel A, the periphery measuring one inch 

 and divided into five equal parts, indicated by fine points, marking when in 

 use each length by a slight indentation upon the map or plan. At each revolu- 

 tion of the wheel a small spring B is struck, indicating that one inch has been 

 traversed. Attached to the instrument is a small scale C, th of an inch in 

 lergth, divided into 10 parts for measuring distances less than one division 

 of the wheel. 



276b. Opisometer. Instrument ordinarily used for the above 

 purpose. S. J. Hawkins. 



277. Measuring Instrument, E. R. Morris's patent. (Silver 

 medal awarded at Manchester, 1875.) For the use of architects, 

 surveyors, builders, contractors, timber merchants, &c., &c., and 

 for general measuring purposes, in place of the rule or tape. It 

 measures to 100 ft., and weighs under 3 oz. 



The Morris Patents Engineering Works, Birmingham. 



To use the instrument it is merely necessary to advance it along the object 

 to be measured, when the large hand will register the inches and fractions of 

 an inch on the outer dial, the smaller hand on the inner dial, the feet and the 

 smallest hand on the recessed dial, the tens 'of feet travelled over. The in- 

 strument registers to 100 feet. Price, electro-silver, in leather case, 16s. 6d. 



