Timesaving Devices for Garage Hand and Draughtsman.
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APARTICTL ABLY interesting pocket calculator, which is equivalent to a slide rule 5 ft. 6 ins, long, is being marketed by Carbic, Ltd., 51, Holborn Viaduct, London, E.C. 1.
A Pocket Calculator.
This instrument, which is known as the Otis King's calculator, is made with varying scales to meet special needs, butthe type which will probably appeal to those of our readers who have to deal with engineering matters is the Model K, which is provided with slide-rule scales, giving four or five significant figures.
The instrument consists of two tubes, the smaller cylinder being free to rotate and slide within the larger, which acts as a holder. A special logarithmic scale is mounted on each of these tubes. A third tube mounted on the holder forms a cursor, and on each end, of the last. named is an arrow which can be set to any mark on the two scales, or to which any mark can be set. The bottom scale mounted on the holder is identical with tha D scale on the stock of a slide rule, whilst the upper scale mounted on a cylinder is similar to the C.scale on the slide of a slide rule. The bottom arrow on.the cursor takes the place of the hairline covering the marks on the D scale, and the upper arrow the place of the hair-line covering the marks onthe C scale (Fig. 2).
A great advantage of this, arrangement is that with the tubular cursor, although it can be moved to any parb of a scale 66' ins. long, requires a maximum move-ment of only 21 ins., whereas on a slide rule the cursor would have to traverse Ihe whole distance.
The type we have just described is known as the L, but the actual example' which we illustrate is the K, which has twoanti-logarithmic scales mounted in series on the cylinder, with the object of combiningthe facilities afforded by the A and B scales of a slide rule, as well as those already mentioned. The price for each model is 21s. post free.
The Senga Pumps for Heavy Oils.
Considerable difficulty is often experi. enced in emptying the heavy oils used for gearboxes, etc., from the drums in which they are contained. The Senga pump, shown in Fig. 1, is one of a series specially designed for this purpose
and marketed by Messrs. Joshua Beaand Sons, Ltd., -Collingwood Street Oil
Works, Liverpool. These pumps are sturdily constructed of annealed malleable cast-iron, and are fitted with pans;
which collect surplus oil. The type shown is that known as Rea's Patent No. 1, other types being made for application to other drums and positions. There is also a Baby design for the small drums used by those who only consume small quantities of oil. _ These pumps can be relied upon to raise the heaviest oils used.
Rosy Replenishment from Drums.
The . device shown in Fig. 3 has been patented by Mr. William -Wharton; of The Gables, Kendal (specification No.' 189,330). The object is to provide a simple means for transferring any de' sired quantity of petrol from a drum to the tank of a vehicle, and this is accom
plished by utilizing the lifting effect of air pressure on the liquid. The device is screwerli into the orifice, when the bung has been removed, and the length can be adjusted according to the size of the drum.
At the top of the pipe 'there are , handles for screwing the device into position, a cock, and is hose connection, a second tap being provided at the other end of the hose. There is also a nonreturn valve and connection for an ordinary tyre pump, which communicates with the interior of the drum through the hole shown. When air is pumped into the drum through this' non-return valve and hole the petrol is forced out through the filter, pipe, and hose into the tank of the vehicle. A meter could be easily interposed between the pipe and the--hose, and, -if this were fitted, the device would -constitute a simple form of -the,large petrol pumps. used at petrol -filling stations.