Show celluloid models in construction A r great engineering works such as bridges athas it has been the custom to construct replicas I 1 sometimes costing many shi thousands disands of dollars which are destroyed in the tests made upon it to determine delenn lne the capacity of the structure ture to resist the strata that la is likely to be put upon it in ID service by a method devised by prof irot george E beggs of Priti celon university models now made tu in celluloid are tested in ID mercury aud and the same information if secured at a greatly decreased expenditure |