Slide rules HOME page COLLECTION 10" RULES GERMANY
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Make Faber Castell, Germany
Model 375 Rietz
Notes

1. Although fairly early this rule shows, in some ways, the variation in the Rietz 'standard'. On this rule the log scale is on the bottom of the stock and the reverse of the slide has sin (S), tan (T) and a sin/tan (ST) scale for small angles.

2. While the trig scales on the reverse of the slide are labelled in the standard way (S, ST and T) those on the front are not.

3. The rule indicates the reason for the extra lines, conversion from Watts to Horse-Power, in the frame of the cursor.

4. The rule was provided in a leather case.
Front view
1117-fc375-01.jpg
Detail - front left
1117-fc375-02.jpg		 Detail - back right
1117-fc375-03.jpg
Detail - Back left
1117-fc375-04.jpg		 Detail - Cursor
1117-fc375-05.jpg (19198 bytes)
Manufacturing date December 1920. (In 1920 Faber Castell started marking the date on their rules as the year after 1920 and the month. As this has the marking 0 and 12, it would appear to date from 1920.)
Length 10"
Material Wood and plastic
Scales K, A [B, C/ S, ST, T] D, L
Cursor Metal and glass, three line cursor.