1920s Lockie's Marine Engineers Drawing And Indicator Diagram Scales

This is a lovely piece of maritime history in the form of a set of 1920s Lockie's Marine Engineers Drawing And Indicator Diagram Scales in a cardboard case: measuring 32.5cm x 3.7cm.

The set comprises seven varnished cardboard drawing and indicator diagram scales by John Lockie, Leith.  

The scales numbered 1-5 are regular imperial scales of various inches to the foot including:-

1. Full Size and Half Size
2. 1 1/2 & 3 inches to 1 foot
3. 4 inches and 2 inches to 1 foot
4. 1/2inch & 1 inch to 1 foot 
5. 3/4 inch and 3/8 inch to 1 foot

The other two scales are not numbered:-

• indicator diagram scale giving figures for pounds to 1 inch

• Metric ruler 

Label on the front of the case reads:-

Board of Trade Examinations

Lockie's

Drawing and 

Indicator

Diagram

Scales

For

Marine Engineers

Price 1/9 Net. per set 

Sole Wholesale Agents Jas. Munro & Co, Ltd, 16 Carrick Street, Glasgow, C2

These scales are increasingly difficult to source. The only other one I have seen resides at the National Maritime Museum, Greenwich, London.