|Object Type:||Test Equipment|
|Object Name:||Adjustable Gap Transfer|
|Year of Manufacture:||circa 1955|
The Adjustable Gap Transfer is a current clamp or current probe which is an electrical device having two jaws which open to allow clamping around an electrical conductor. These devices have a split ring made of ferrite or soft iron. A wire coil is wound round one or both halves, forming one winding of a current transformer. The conductor around which it is clamped forms the other winding. Like any transformer this type works only with AC or pulse waveforms.
The instrument gives a safe and remote measure of the current passing through the cable. It is marked on a label as having three ranges 50, 10.5 and 2.5 Amp. There is also a note that it is ‘Pre-Shotter Patent. But not patented’. George Frederick Shotter was quite a prolific inventor working at New Southgate in England and he has many Patents relating to transformers and motor design. Some of his Patents relevant to this Adjustable Gap Transfer can be found around 1926 but this is more likely to be an experimental device from the 1950 -60 period.
This item was part of the original Elliott Collection Ref: 1018