151 070 ISOGRAPH 2000 0,70mm
Year: 1978

151070 rotring isograph 2000 technical pen 0.70mm

This is the lotest of the various tubular drawing pens to be manufactured by rotring and comes after years of technical research. It has
been made to overcome difficulties that generally arise with drawing pens during use, namely, drying up of ink around writing parts, inconsistent drawing ink flow and troublesome maintenance and cleaning.
The isograph drawing pen sets a new standard in ink drawing technology. lt's name reflects its close connection with the continuing international standardisations of lines and lettering used in technical drawings formulated by the International Organization for Standardization (ISO).

The isograph drawing pen carries the symbol 'm' and fulfills all requirements for
microfilming. The isograph drawing pen fits perfectly into the complete rotring system of drawing instruments, i.e. may be used with rotring ISO and micronorm stencils and with rotring compasses.
The line thicknesses rise in increments directly corresponding to the ISO 'A' paper sizes i.e. increasing in incremental steps of ?2 and thus match the increments of standardized drawing sheets. The self coloured ring of the finger grip indicates the appropriate colour code of the line thickness which is stamped twice on the finger grip as is the 'm' symbol.

The added advantages of the isograph drawing point secions are that the metal bush allows an unobstructed view of the drawing surface.
The bush is accurately machined and may be used in conjunction with additional instruments and automatic drafting machines having 3 mm or 5 mm barings.
The tip of the section is stepped to prevent ink from running under flat rulers or stencils and is specially hard chrome plated to give long service life.
It glides over the drawing surface without scratching.

The isograph has refillable ink reservoir. (making it more practical then rapidograph)
Its patented push-on sleeve makes for easy access to the ink helix for fast cleaning.

Available sizes:
151 013 0.13 mm violet mISO
151 018 0.18 mm red mISO
151 025 0.25 mm white mISO
151 035 0.35 mm yellow mISO
151 050 0.50 mm brown mISO
151 070 0.70 mm blue mISO
151 100 1.00 mm orange mISO
151 140 1.40 mm green mISO
151 200 2.00 mm light grey mISO

In production since 1976., this particular item is from 1978. when pens were marked as isograph 2000.
in 1984. lines separated to just '2000' (DIN 15 (series 2) )and 'ISOGRAPH' (ISO/DIS 128 DIN 15 (Series 1) + lettering ISO 3098/1 DIN 6776 ) with different available nib sizes.

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