444 



THE HUMAN MOTOR 



Fig. 306. Building material scientifically arranged. 



(7) The bricklayer >vill have at hand a support in which to 

 rest his trowel. The mortar will be properly prepared without 

 jumps or stones in it. The trowel should be of a special type, by 

 which the mortar can be spread on several bricks at once. Gil- 

 breth recommends the " Fontain " pattern of trowel, with which 

 21 bricks at a time can be spread with mortar. 



(8) The bricklayer's labourer should use a two-wheeled barrow, 

 since he can thereby transport 216 bricks with the same fatigue 

 as 60 bricks can be transported with a single-wheeled barrow 

 (the ordinary brick measures 22 x 11 X 5-5 centimetres). 



(9) The weight of the tools is of some importance ; the hammer 

 used should weigh from 1-8 kg. to 2 kg. The shovel for mixing 

 the moitar should weigh 9-75 kg. A smaller trowel should be 

 used for pressed bricks and a larger one for ordinary bricks. 



Enhanced output is not to be attained by improvement in 

 tools and appliances alone. Gilbreth also gave attention to the 

 " internal factors," the nourishment and the mental and bodily 

 health of the worker, and he specially studied the problems of 

 economic movement, and came to the following conclusions : 



(10) The feet of the workman should be so disposed that the 

 bricks can be rapidly laid without any unnecessary movements 

 of the body. The hands should move symmetrically and evenly. 

 The movements should be combined to serve various purposes. 

 Fallen mortar should not be picked up during working. It is 

 cheaper to fill a space less than halt a brick in width with good 

 cement than to spend time in cutting a brick to suit or in looking 

 for a suitable piece to fill the space. 



(11) The motions of the bricklayer should be restricted to those 

 actually needed for the work he is doing, thus a bag of cement 



