Visual particle detection methods have been used with high energy bremsstrahlung beams of low intensity. A method for obtaining a substantial increase in the gamma‐ray beam intensity which can be passed through a 9‐in. propane bubble chamber is described. The beam is collimated and then led through a hollow tube passing through the middle of the bubble chamber. It was found that use of a ``beam tube'' increases the number of events observed per picture by a factor between five and ten over the number found with no beam tube. The 300‐Mev bremsstrahlung beam of the MIT synchrotron beam was used for these experiments. Advantages and limitations of the beam tube method are discussed.