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The A and M series blasting machines are housed in black metal cases.
Each has a small crank, an indicator lamp and two condenser terminals.
As the crank is turned, the direct current generator charges a condenser.
When the required voltage is reached, the indicator lamp glows.
By turning the crank a few more times the condenser discharges and fires the electric caps in the blasting circuit.
If the lamp does not darken after the additional crank turns, a short or break in the demolition circuit is indicated.
The A 5106 and M504 are manufactured with various capacities.



A 5105 :
Length: 130mm , width: 130mm , height: 200mm.
Circuit resistance: 260 Ohms.
 
A 5106 W :
Length: 130mm , width: 130mm , height: 200mm.
Circuit resistance: 520 Ohms.
 
M 504 K :
Length: 115mm , width: 90mm , height: 145mm.
Circuit resistance: 260 Ohms.
 


M 524 :
Length: 115mm , width: 90mm , height: 145mm.
Circuit resistance: 510 Ohms.
 
  M 514 :
Length: 115mm , width: 90mm , height: 145mm.
Circuit resistance: 1020 Ohms.