45, CORNIIILL, B.C., AND 122, REGENT STREET, W., LONDON. 



^ 



201 



FIG. A. 



FIG. c. 



HARDING PATENT CIRCULAR DIAL ENGINE COUNTER. 

 591 The ease with which the record of these Counters can at any time be read off 

 is a great advantage which they possess over all dial counters (such as those on 

 water and gas meters), in the difficult reading of which important errors are often 

 made. 



Other advantages of these Counters are, great simplicity of parts and solidity 

 of construction, in consequence of which it is almost impossible for the apparatus 

 to get out of order. 



It consists in an ingenious combination of wheels and pinions. Each number 

 wheel carries on the right edge of its rim twenty teeth, and on the left edge only 

 two. The pinions are provided with eight unequal teeth, four being as broad and 

 four half as broad as the pinion. Thus, as each number wheel completes its revo- 

 lution, it moves the next one on one-tenth, and all the wheels are safely locked, 

 except at the moment when they are being moved forward by their pinions. Some 

 idea of the perfection of this arrangement may be gathered from the fact that the 

 Pocket Counter or Speedometer, of which the mechanism is a mere reduction of that 

 of the large Counters, may be used at speeds over 5,000 per minute. 



PRICE LIST FOR CIRCULAR AND SQUARE ENGINE COUNTERS. 

 No (A) Large Engine Counter, 7 figures, to count to ten millions, with s. a. 

 rotary or reciprocating motion, and -arranged so as to readily 

 set back to zero (fig. A) . . . . . . . . 5 10 



Square Engine Counter, ten inches long, 5 figures 5 10 



Ditto Ditto with superior Clock lever movement for use in 



Marine Engine rooms. The Patent Enamelled Number Wheels 

 shew indelible black figures on a white ground specially useful 



in dark positions 11 11 



No. (B) Small Machine Counters (with rotary action only), with 6 figures 2 10 

 Ditto ditto with 4 figures 330 



No. (c) Pocket Counter or Speedometer (plated, and in handsome case), 



with 4 figures, and steel friction bits (fig. c) . . . 2 10 



No. (D) Turnstile Counters, 5 figures 3 15 



Harding's Improved Engine Counters to suit customers' special requirements made vp to 

 order. Full details should be supplied as to what is desired. 



