In [Fig. 40] is shown a complete set of paint grinding and mixing machinery, made by Wright & Co., 157 Southwark Bridge Road, London, S.E., which has given highly satisfactory results in efficiency and economy. It has a set of three granite rollers 30 inches by 15, and two mixing cylinders or pugs, 24 inches in diameter by 25 inches deep, the whole mounted on a strong cast-iron frame. It is made in the following five sizes:—
| No. | 3-roller Mills Size of Roller. | Diam. of Pulleys. | Speed of Pulleys. | Weight. (Approx.) | Work turned out per day. | |
| Ordinary Colours. | White Lead. | |||||
| in. in. | in. | cwt. | tons. | tons. | ||
| 1 | 16 × 9 | 18 | 70 | 12 | ½ to ¾ | 1½ |
| 2 | 22 × 12 | 24 | 60 | 16 | 1 2 | 4 |
| 3 | 22 × 14 | 26 | 55 | 22 | 3 4 | 8 |
| 4 | 30 × 15 | 30 | 50 | 30 | 4 5 | 10 |
| 5 | 36 × 16 | 30 | 50 | 35 | 5 6 | 12 |
The utility of having the pug mills placed above the granite rollers is to save labour and space, and the roller mill is kept constantly at work. There are two pugs, one of which is always ready to deliver to the rollers, whilst the other is getting ready by the time the first is being emptied; by this means the output is always going on, and hence great saving both of time and labour. The pugs are
Fig. 40.—Wright’s Paint Mill.
easily fed from a wooden stage fixed to the frame at the back of pugs. The drawing shows the gear driven by a cog-wheel, but if required it can be driven by fast and loose pulleys. The whole of the machine is very compact.
A handy little grinding machine by the same well-known firm is shown in [Fig. 41]; a liquid-paint mixer, in [Fig. 42]; and a single pug mill for paint or putty, in [Fig. 43]. Neither of these machines requires any special description, as the mode of application is evident from the illustrations.