Faber-Castell 310/88,89

(20cm Scale OHP rule, Demonstration, Rietz-N & Log Log)

Faber-Castell 310/88,89 (c1970-75)
		Summary
		System:	Rietz-N & Log Log
		Specialization:	School OHP demonstration
		Type:	Overhead projection
		Material:	White & clear plastic
		Facings:	-
		Scale Length:	20cm	No of Scales:	21
		Front Length:	246mm	Front Width:	59mm
		Language:	English	Origin:	Germany
		Date:	c1970-75
Features/Notes:	OHP demonstration rule for 57/88 & 57/89
Scales (colours as shown)
Front:	K, A [ B, L, CI, C ] D, S, ST, T1, T2	Back:	K, A [ LL2, S, LL3 ] D, S, ST, T1, T2
Labels Left:	K, A [ B, L, CI, C ] D, S, ST, T1, T2	Labels Left:	K, A [ LL2, S', LL3 ] D, S, ST, T1, T2
Labels Right:	X3, X2 [ X2, lgX, 1/X, X ] X, <sin0.1X cos, <arc0.01X, <tan0.1X cot, <tanX cot	Labels Right:	X3, X2 [ e0.1X, <sin0.1X cos, eX ] X, <sin0.1X cos, <arc0.01X, <tan0.1X cot, <tanX cot
Style:	Normal	Typeface:	Sans-serif
Extensions:	-	Decimals:	Tenths between 1 & 2 on CI, C & D
Gauge Marks:	p (3.14) on A, B, CI, C & D M (1/p=0.318) on A & B C (1.13) on C C1 (3.57) on C r (1745) on C & D e (2.718) on LL2 & LL3	Rulers:	-
Features/Notes:	A, B, C & D feature a mint green background numbers are printed in red on CI. cos numbers are printed in red on S. cot numbers are printed in red on T.
Construction
Stock:	3mm thick clear plastic, coloured green outsite of the two 'faces' of the rule. Laminated white plastic slide and cursor runners on front top and bottom edges with mitred corners. Four end mounted steel springs in the slide groove of the top runner to tension the slide. Two sponge pads along the top and bottom edges of the back - width x depth (mm) 29 x 2 Stock Length x Width (mm) 370 x 200 Top runner Width x Depth (mm) 20 x 9 Bottom runner Width x Depth (mm) 16 x 6
Slide:	Clear plastic with mitred corners Green plastic mitred grip located towards the bottom left hand end. Length x width x (mm) - 370 x 168	Cursor:	Clear plastic pane attached at the top to white plastic guide with green plastic mitred grip. White plastic protection pieces attached to the front and back of the bottom of the pane. Two end mounted steel springs attached to inside top of guide. Single centre full length broken hairline for 'front' and 'back' scales, labelled "kw" on the 'front' A scale and "d" on the 'front' D scale. Two short non-equidistant hairlines for 'front' A & B scales, left of centre labelled "q", right of centre labelled "PS". Two short non-equidistant hairlines for 'front' C & C scales, left of centre labelled "kW", right of centre labelled "PS". Overall length x width x depth (mm) - 168 x 80 x 8 Pane length x width x depth (mm) - 136 x 40 x 2 Grip length x Width x hight (mm) - 18 x 10 x 10 Additional single hairline cursor pane with white plastic end piece and mitred corners. Overall length x width x depth (mm) - 114 x 50 x 4.5 Pane thickness 1 mm
Printing (colours as shown)
Stock:	Oval "FABER-CASTELL" logo with shield to the left of the 'front' face with "310/88,89" underneath, and "MADE IN GERMANY" below that. "FABER-CASTELL 57/88,89" in centre between 'front' and 'back' faces.
Slide:	-
Cursor:	"CASTELL" on lower right front of guide. "310/88,89" on back of pane behind lower rail of guide.
Labels:	None
Instructions
The OHP rule came with a 12 page Dutch language instruction booklet for school models 57/88 and 57/89, which can be seen here. Also included was an A4 German/English information sheet detailing the correct application of the rule, seen here.
Box (colours as shown)
Style:	Square	L x W x D mm:	385 x 230 x 35
Material:	Cardboard	Colour:	Green
Construction:	2 part - tray and lid. Cloth covered. Paper facing on back.
Printing:	Oval "FABER-CASTELL" logo with shield + "projektions-rechenstab" on the bottom right of the front of the lid. "310/88/89" on the top right of the back of the tray.
Labels:	None
Detail Images
^^ Top ^^ Click on the images for enlargements. ^^ Top ^^ Click on the images for enlargements. ^^ Top ^^ Click on the images for enlargements. ^^ Top ^^ Click on the images for enlargements. ^^ Top ^^ Click on the images for enlargements. ^^ Top ^^ Click on the images for enlargements. ^^ Top ^^ Click on the images for enlargements. ^^ Top ^^ Click on the images for enlargements. ^^ Top ^^ Click on the images for enlargements.