Canadian Foresir}) Journal, November, 1919 



437 



No, this is not a handful of wheat on a lable-iup. it i.■^ an aviiaj pliotngrapli ot a log boom 

 on the St. Maurice River. Quebec, taken by one of the seaplanes of the St. Maurice Forest 

 Protective Association. The Forestry Journal is informed that by counting the number of logs 

 in a square centimetre of the photograph, the total contents of the boom can be easily and 

 accurately computed. It is declared to be more exact than by any other known method. 



Several radio telegraph stations should be 

 dotted over the area of flying operations, so 

 that a fire may be reported immediately it is 

 sighted, or a forced landing investigated by a 

 second machine. Undoubtedly every air base 

 should have at least two machines and two 

 pilots, and it is only by this means that abso- 

 lute satisfaction from the work may be ex- 

 pected. 



SAFETY FOR HUMAN CARGO. 



No serious-thinking business man should be 

 willing to go into flying extensively unless he 

 can determine what factors are responsible for 

 his safety in the a'lr, and these factors may be 

 grouped the safety of construction and design 

 of the 'plane, the efficiency of the power unit, 

 and the possibility of a safe landing in case of 

 trouble. 



Manufacturers of efficient aircraft test these 

 planes by acrobatics, which strain all parts of 

 the machine five to ten times greater than they 

 are ever called upon to stand in commercial 



flying, and the liability through constructional 

 faults is nil, if the machines are cared for by a 

 competent staff. The old danger of fire is also 

 eliminated on a good make of machine, when 

 properly cared for. 



HIGH FLYING ON ONF. MOTOR. 



With the best make of motor car, you cannot 

 guarantee a long trip with absolutely no engine 

 trouble, the same thing is true of an aeroplane 

 motor. The gas engine has been greatly im- 

 proved, but is not perfect. To overcome this 

 uncertainty, we must, when using only one 

 motor in a plane, fly at an altitude of four or 

 five thousand feet, which affords an opportun- 

 ity to land on a lake, if necessary, about four 

 miles distant in any direction, this distance 

 being dependent on the direction and strength 

 of the wind. 



It may be interesting to the uninitiated to 

 note that an airplane operates the same whether 

 the motor is running or not, and can maintain 

 the same speed. The motor does not govern 



