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An ingenious adding device that can be operated on the same principle as a dial on an 

 automatic telephone. It is adapted to the work of accountants and bookkeepers 



Simple Adding Machine Conve- 

 nient to Handle 



WITH no keys to press and no levers 

 to manipulate, the simple adding 

 machine shown in the accompanying 

 illustration is particularly adaptable to 

 the work of accountants and bookkeepers. 

 The device consists of a base with seven 

 notched dials representing cents, dollars, 

 and tens, hundreds, and so on up to 

 $99,999.99. 



The device operates on the same princi- 

 ple as the dial on an automatic telephone. 

 For instance, if you wish to add $3.64 and 

 $42.80, you place the pencil-like stylus 

 which comes with the machine, opposite 

 figure 3 in the dollars column and turn the 

 dial to the right as far as it will go. Similar 

 movements are made for the 6 and the 4 

 in their respective cents columns. In- 

 side each dial is a large notch or win- 

 dow and the figure 

 3.64 will be found reg- 

 istered in red figures 

 in these notches in 

 the first three dials 

 from the right. If 

 $42.80 is registered in 

 like manner, the total 

 will appear in red fig- 

 ures on the 

 four dials from 

 the right. 



For s u b - 

 traction the 

 same princi- 

 ple is used, 

 except that 

 the totals are 

 shown on the 

 white figures. 

 The machine 

 can also mul- 

 tiply. 



TAR 

 KETTLE 



HEATED 

 TAR. OUT 



HOT GASES UNDER. 

 TAR KETTLE, AND 

 UP OUT OF STACK 



Combination tar and 



gravel heater device in 

 operation. The furnace is fired from the gravel end 



Heating Tar and Gravel Separately 

 But in One Operation 



EMULATING the famous hunter of 

 the olden days who killed two birds 

 with one stone, a New Jersey manu- 

 facturer has recently brought out a com- 

 bination tar and gravel heater that heats 

 these two dissimilar materials quite inde- 

 pendently but with one operation. The 

 device, which is shown in the accompany- 

 ing illustration, is particularly fitted for 

 street paving where block pavements with 

 tar joints are laid. 



The apparatus consists of two main 

 parts, a rectangular tar kettle and a 

 Y-shaped gravel-bin, with a furnace 

 extending beneath both parts, from 

 one end to the other. The furnace is 

 fired from the gravel end of the device. 

 The smoke and gases escape through an 

 ordinary stove pipe in the kettle end. 

 The inside of the gravel heater is 

 triangular-shaped while the outside 

 is made up in steps consisting of 

 perforated metal plates. The Y- 

 shaped top acts as a 

 reservoir bin and the 

 gravel feeds down the 

 steps and out at the 

 bottom. The perfora- 

 tions in the 

 step plates al- 

 low the moist- 

 ure in the gra- 



,,7--.^.^ .» vel to escape 

 PWkTES FOR j-i :+. 



STEl^M ESCAPE readily as it 

 is turned into 

 steam by the 

 heat of the 

 fire, thereby 

 making it pos- 

 sible to heat 

 both tar and 

 gravel. 



GRAVEL BIN 



RERFORATED 



FURNACE 



