Engineering/Technical Drawing Instruments

[sharrib]

Hi

I have a Compass 360 degree in a wooden box. It is non magnetic and I cannot tell if it is brass or not..It’s a very light in colour metal. I know it is very old and belonged to a civil engineer along with some tech drawing / engineering rulers (set of 50) also in a beautiful solid wooden box.
Each ruler is curved to a degree and has a number on it and it’s labelled British made.

Does anyone know the exact description of these 2 items and what they are used for and the value of each.

Many thanks in advance.
Sharon

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[sharrib]

Apologies..I forgot to insert some description.. The Protractor has the inscription: STANLEY, GREAT TURNSTILE, HOLBORN, LONDON…

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