Agroshield
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The two needles was a very good spot, Mr 500e.
See this reference:
https://discovery.nationalarchives.gov.uk/details/r/C2233088
I think it is a differential pressure gauge. For a modern one, see http://www.ashfordinstrumentation.com/products.aspx?xml=df&id=OP-46
I do not know how it might be used with one leg open to atmosphere. Does the bit on the back held by two slotted screws (between the jaws of the spanner) look complete and unbroken (i.e the tube coming out the back just stops where it does)?
Edit:
Have a read of the description on this page:
http://www.ashfordinstrumentation.com/products.aspx?xml=sm&id=MS-17
where it says the gauges are compensated for water pressure. So if you are trying to put 200psi into your torpedo tube, but the sea is pressing on it with 190psi, you will only put 10psi into it.
It might be worth dropping a line to Ashford to see if they could shed any light on it.
See this reference:
https://discovery.nationalarchives.gov.uk/details/r/C2233088
I think it is a differential pressure gauge. For a modern one, see http://www.ashfordinstrumentation.com/products.aspx?xml=df&id=OP-46
I do not know how it might be used with one leg open to atmosphere. Does the bit on the back held by two slotted screws (between the jaws of the spanner) look complete and unbroken (i.e the tube coming out the back just stops where it does)?
Edit:
Have a read of the description on this page:
http://www.ashfordinstrumentation.com/products.aspx?xml=sm&id=MS-17
where it says the gauges are compensated for water pressure. So if you are trying to put 200psi into your torpedo tube, but the sea is pressing on it with 190psi, you will only put 10psi into it.
It might be worth dropping a line to Ashford to see if they could shed any light on it.