British Military ‘Vee Tee’ Slide Rule Instrument – c.1920s. ...

Estimate

£30 - £40

British Military ‘Vee Tee’ Slide Rule Instrument – c.1920s. This unusual slide rule instrument is designed for military vehicle logistics. It is similar in design to a version (thought to be slightly later) known as the MT Rule. The Vee Tee Meter is intended to be used for calculating the length of a column of vehicles and the time it takes them to pass a given position. It consists of a closed frame duplex stock of laminated plastic (ivorine), held together with four pins, and a double-sided slide. It comes in a brown leatherette pouch. On the front of the meter there are two scales on the stock: Vehicles (number of) and Times Past S.P. The slide also has two scales: V.T.M. (vehicles to the mile) and M.P.H. On the reverse, there is a small window where Length of Column in Yards & Miles can be read from the reverse of the slide. The reverse also bears the legend ‘Vee Tee Meter’. There is no manufacturer’s mark. Scarce