SECTIONAL TRANSACTIONS.— A. 343 



ice.' Portable refrigerators in delivery vans. A large amount of insulation 

 is now being installed to keep us cool in summer and to lessen the winter's 

 fuel bill. Air conditioning and automatic humidification are becoming 

 popular. Trans-continental trains are air-conditioned. 



Geology. — An increasing use is made of physical methods for the solution 

 of problems in detection of icebergs. Ice in rivers closes navigation and 

 delays the reopening. Ice chokes the inlets of hydro-electric stations and 

 the turbines. Ice does damage on power transmission lines and on the 

 wings of aeroplanes. 



Air-navigation and Radio. — The Northern Canadian Airlines carry much 

 more freight than the air hnes of any other country. This is due to the 

 development of mining in the north country. For the same reasons radio 

 broadcasting has proved a great boon, lessening the isolation experienced in 

 more lonely spots and enabling medical advice and air transportation to be 

 used in cases of severe illness. 



Forest fires are reported by air and radio and then are fought by men 

 carried into the fire areas. 



General. — The Universities are waking up to the need of providing men 

 for these physical services. Graduate courses in meteorology and geo- 

 physics are now provided by the Physics Department of the University of 

 Toronto, and an honours course in biology and physics has been started to 

 train biologists with a sufficient knowledge of physics to study the problems 

 of refrigeration — a subject so very important in a large agricultural country 

 like Canada, and becoming more important as time goes on. 



Afternoon. 

 Prof. W, Davis. — The physical properties of knitted fabrics (2.30). 



(i) Place of the knitted fabric in textiles. 



(2) Trend towards lighter-weight clothing. 



(3) Properties of thickness, weight and compressibility, instruments for 

 measuring these. Bulk/weight index of fabrics. 



(4) Principles of wear testing ; abrasion tests on textiles ; temperature 

 of abrasion ; apparatus used. 



(5) Testing fabrics by bursting ; machines used. Tensile strength and 

 elongation of fibres ; yarns and fabrics under controlled conditions 

 of temperature and humidity ; the temperature/humidity control 

 chamber. Stress/strain diagrams for wool, cotton and rayon. 



(6) Apparatus used for testing flexibility, air permeability and the measure- 

 ment of lustre on fabrics. 



(7) Use of the ultra-violet lamp in detecting fabric faults. Lamps used 

 for estimating the colour fastness ; standard whites. 



Working demonstration of newest types of experimental apparatus. 



Afternoon. 



Visits to Messrs. Boots' Works, Island Street, Nottingham ; to L.M.S. 

 Railway Research Station, Derby, and to Messrs. Rolls Royce Works, 

 Derby. 



