208 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



For the purpose of loading, a runner is placed in position and 

 attached to hooks on the bolster, 



A horse is used to draw the tree-trunk on to the trolley. For 

 this purpose a chain, attached to the neck of the trolley-pole, is 

 slipped under the log, brought round and finally fastened to the 

 hook of the swing-tree (see Plate XXIII. Fig. i); the horse then 

 draws the log into position. The chain is now unhooked from 

 the swing- tree and hitched round the log towards the small end. 

 When the horse, which is next yoked to the trolley, begins to 

 draw, the chain tightens round the log without any racking 



(Fig. 2). 



The writer has used the trolley most successfully at Poltalloch, 

 and several timber merchants here and elsewhere have adopted 

 the device with equally successful results. Those used by the 

 writer in England were well finished by an expert cartwright, 

 and cost ^lo each ; but they can be made in rougher fashion 

 for half this sum, as is the case with those in use here. The 

 following are the part measurements of the trolley : — 



1. Breadth of wheel tyres, made up of two 



6-inch wide rings . . . . . 12 inches. 



2. The wheels, made of three 4-inch planks, 



are bolted together, so that the centre 

 of the 6-inch tyre crosses the joint. The 

 writer has substituted round blocks of 

 wood. Diameter of wheel . 



3. Bolster between wheels (length) 



4. Bolster on top ..... 



5. Depth of bolster between wheels 

 ■6. Length of pole inserted through bolster 



including ring at point end . . . 72 „ 



7. Length of square frame on which the pole 



lies. The writer has substituted different 



bolster arrangement . . . . 42 ,, 



8. Length of pole for loading, including two 



hooks which drop into staples on each 



side of bolster end above wheel . . 60 „ 



The breadth of the wheels prevents the breaking-up of ground 

 or grass surface, while since it is low of build the trolley is 

 easily loaded and unloaded. As the root-end of the tree is 

 loaded on the bolster the load is a great deal easier for the horse 



