PRIMARY SPARK COILS. 



FOR ELECTRIC c; \s UOHTIKO, 



Cat. No. 48304. 8 inch Price, each, 



" 50304. 10 " 



52304. 12 " 



54304. Detached Gas Lighting Relays 



For Spark Coils with Relay Attachment, add $2 50 to price f"r Spark ( toll. 



Figure 23. — Type of spark coil the Duryeas are believed to 

 have used in their electrical circuit, as shown in a catalog 

 illustration. (Smithsonian photo 46858 V 



*H 20 

 8 TO 

 4 SO 



mission, explaining the plan to Charles: "The three 



1 on secondary shaft have friction clutches, the 

 two bevel gears on same shaft are controlled by a 

 clutch which frees one and clutches the other at will. 

 This provides a reverse." 



I he Springfield E< Union of September 22 car- 



ried a notice of the trial. This report, too. commented 

 on the faulty transmission and the plan already in 

 Frank's mind for the new transmission. 



. . . I he friction belt allowed of the speed being 



I or diminished at the will of the driver 



and caused no sudden forward mod in of the carriage, 



but while this arrangement has many advantages it 



uses up the power so that the two-horse power furnished 

 by the m itor [somewhat less than the rating Frank gave 

 the engine] was reduced to less than three-fourths horse 

 power on reaching the main shaft. This would not be 

 sufficient to propel the carriage up steep grades but 

 would be sufficient to run the carriage on level road. 

 The inventors will do away with this belt in favoi of 



a clamp year and will make the drum wheel smaller. 

 By this means there will be very little powei lost in 



transmission to the shah and by a patented ai rangement 

 the carriage may he started gradually hut the speed 

 must he increased by shifting the clamp year to a sua es- 

 sion of gears on the driving wheel of the motor. The 

 i ige will lie fixed permanently at cording 

 to the size of the gear that die smaller one is shifted to. 



The test of the machine with the gear arrangement will 

 be made soon. 



In Octobei Frank decided on another vacation and 

 went to Chicago to see the Columbian Exposition. 

 Charles had come up from Peoria to sec the fair and 

 the two talked i >\ er the progress on their motor v. 

 and discussed the transmission problem. They gave 

 particular attention to everything relating to engines 

 and motor carriages, and I tank recalls seeing a 

 Daimler quadricycle that impressed him with it- 

 performance. 31 Just what decisions the two might 

 have made there are unknown, yet it is likely that they 

 agreed to give the old transmission one more chance 

 to prove itself. 



Returning to Springfield, probably in the first 

 week of November, Frank gave the friction drive its 

 final test, this time substituting a leather belt for the 

 rubber one first used. -' Mr. Markham, though in- 

 tensely interested in the experimi nts, apparently was 

 dubious concerning the safety of the carriagi I 1 I id 

 no brakes, and fearing Failure of the transmission on 

 a downgrade, he was reluctant to ride in the machine. 

 ( >n November 9 he asked Will Bemis to try it for him. 

 The follow in« day the Spring/fid Morning Union gave 

 a description of the run: 



Residents in the vicinity of Florence street Hoiked to 

 the windows \esieid.i\ aftei noon astonished to see gliding 

 by in the roadwa\ a common top carriage with no shafts 



\* actually constructed there are only two ceais on the 

 secondary shaft. He obviously discovered that one gear 

 1 to two clutches would serve for both forward and 

 reverse. Space was also limited. 



31 Recorded interview with Frank Duryea in U.S. National 

 Museum. V tnbei ', 1956. 



w Lettei from link Duryea to Charles Duryea, November 

 8, 1893. Copy in Museum files. 



PAPER 34: THE 1893 DURYEA AUTOMOBILE 



