machine, wliicli can be had at Baker's establishment, 224, High 

 Ilolborn. 



THE DOU13LK CYLINDER AIR-I>UMP. 



On trying liic two pumps together witii llie "Kelson Lines" — 

 beautifully made in all sizes for the trade by Morris Carswell, 90, 

 Mitchell Street, Glasgow — incredible as it may sound to the un- 

 initiated, it was soon seen that the double cylinder pumj) extracts 

 more air from the line, and consequently that more oil finds its way 

 into the silk. In this respect, obviously, it must have very im]-)ortant 

 results. Nor does it require an intimate knowledge of the intricacies of 

 pneumatics to offer an exjilanation of this somewhat remarkable fact. 



