Page 26 Advertisements Column 1

Otago Witness, Issue 3414, 20 August 1919, Page 26

The Link-Blade Bowl versus The Disc Bowl. A GREAT amount of controversy lias oome about lately as to the relative efficiency of the two methods of skimming used in separators of various makes. As a matter of fact, the same basic principle—viz., the tendency of the cream to travel to the centre and the heavier skimmed milk to flow to the outside, underlies both systems. ' After a great amount of experiment the manufacturers of the well-known Velox machines found that for separators up to 50 gallons per hour capacity, the link-blade bowl had many advantages over the disc bowl. In the disc bowl it is most essential that the layers of milk be very thin, otherwise the milk will slide, and not revolve at the same speed, as the bowl. Moreover, the distance between the ' plates m\ist always be the same. For many reasons it happens that in smaller sized separators the layers do not remain the same. Take two layers of milk, one say twice as thick as the other. Precisely the same force—viz., the friction between the disc surfaces is to bring the bigger quantity of milk into rotation as the smaller quantity. What happens? Obviously it requires double the time. With a few inaccurate layers the capacity of the separator is first of all reduced, and, secondly, on account of these varying currents in the bowl, the skimming efficiency is reduced. Now to the Link-blade system'- In this bowl the milk is* brought into rotation mechanically, and as soon as it comes between the discs it must revolve at tihe same speed as the bowl, thus ensuring the necessary centrifugal force. On account of this mechanical action it is possible (and this is a great advantage) to have a larger space between the blade 3, consequently fewer plates and a smaller bowl. With fewer plates they can be made of stouter material, and this is why the link bowl can be guaranteed as long as the frame itself. At this stage attention might also be drawn to the point that, in the link bowl, all the blades are connected on a ring, and, therefore, always kept together. They are easily inserted into the bowl, whereas the plates of smaller sized separators are always troublesome to assemble, and, in consequence of what has been said before, must be of flimsy material. With the mechanical action of the link-blade bowl, full service of each layer is ensured, whether the distances between the plates are accurately the same or not. Herein lies another great advantage. All Velox separators up to 50 gallon capacity are constructed on the linkblade system. Those of larger capacity are on the disc system, because they can be made more strongly and 'accurately than the smaller sizes, and, therefore, the advantages apparent when the question comes to £he smaller sizes are lost. Farmers have told us in regard to some other makes, that they do not craie up to their rated capacity. Beware when you buy a separator of say 18 "gallon capacity that you don't really get one of only 15 gallons. Make sure. Don't be misled. Our confidence in the Velox is such that w r e are prepared to give you one month's free trial on your farm. This offer is genuine—it is straightforward. Choose the separator you want, and write us. You oan have any Velox outfit on one month's free trial —freight free. Work it • under your own conditions, and after four weeks make your decision. Prices : Size 00 lOgal per hour ... 615 0 „ OA 15gal per hour ... 910 0 „ 1A 27gal per hour ... 14 10 0 „ 2A Hand—-50gal per hour - ... 25 10 0 „ 2A Hand and Power —sogal per hour 29 0 0 „ 3 A Hand—B2gal per hour ... ... ... 38 0 0 „ 3A Hand and Power -82 gal per hour 42 10 0 „ 4A Hand—llsgal per hour 48 10 0 „ 4A Hand and Power —llsgal per hour 53 10 0 High Stand OA and 1A ... 110 0 „ „ 2A and 3A ... 2 5 0 „ 4A ... 210 0 Rattray Street, Dunedin.

PATENTS Designs and Trade Marks Prepared f*s ull Available Countries, (Established 1882.) CONSULTING MECHANICAL ENGINEER and ARCHITECT, STOKES' BUILDINGS, No. 9IA STREET. Residence: 64 FREDERICK STREET (Corner of Clarendon street), DTJNEDIN. Enquire about Cheap Design Protection fc* Small Inventions. Some of the most famous Patents spring from the simplest ideas. TELEPHONES: Residence and Office, 473. Telegrams: "DAVEY, DUNEDIN." TRADE MARKS DESIGNS obtained in all available countries at ' rnn' moderate charges. .Write or call for new Handbook. FREE. REGISTERED .PATENT ATTORNEY, 40 DOWLING STREET, DUNEDIN, Christchurch, Timaru, Invercargill. G-TTCME BOOTS FORWARDED TO ANY ADDRESS ' •' RAIL OR POST. HIP AND KNEE BOOTS. Best Brands. RUBBER GOODS AND OILSKIN ~ CLOTHING A SPECIALTY. J. WATSON, Importer, Port Chalmers.