orifice 18 opens into an air collection chamber 20 which communicates with air escape channels 22 which may radiate regularly therefrom air collection chamber 20 is in turn in fluid registry with a temperature transmitter which may be axially disposed within body portion 14 in the present illustration the temperature transmitter comprises a generally cylindrical thermally absorptive tube 24 such as a 34 resonance tube 34 which is capable of converting cyclical increases and decreases in air pressure into thermal energy which may then be stored at the sealed end 26 thereof the operation of the resonance tube in combination with the nozzle and air collection chamber collectively known in the art as a 34 pneumatic match 34 will be discussed in greater detail later on continuing further with fig1 tube 24 is in turn in contact with a fragmentation promoter assembly which resides in releasable engagement with the body portion 14 the promoter assembly as illustrated in fig1 comprises a spring loaded retaining collar 28 which employs a protruding rim or ring 30 which secures the adjacent longitudinal segments 32 of body portion 14 in contact adjacent each other referring briefly to fig2 segments 32 as illustrated may be radially divided into equal arcuate sections determined in relation to the cross sectional configuration of body portion 14 referring further to fig1.