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ALRO: PTT DECIBEL (AC-1.42)

ALRO PTT DECIBEL (AC-1.42) Radio

Details of: ALRO - PTT DECIBEL (AC-1.42)

Type? Usually a generic name preceded by the form if not standard linear length - e.g. Pocket Enhanced Mannheim. For special models often supplemented by its function/use - e.g. meteorology. Sometimes a suffix is needed to distinguish between different versions - e.g. early or late. Radio
Sort? L/C/D/T/W/X where L=Linear, C=circular, D=Drum, T=tubular, W=watch, X=miscellaneous (i.e. the rest) C
Construction? Basic construction form of the body i.e. Closed/solid frame or Open frame or Duplex or Other Duplex
Material? Basic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. wood/veneered, wood/painted, etc plastic/metal
Length? Mostly length in cm or ” (inches) of the D scale but excluding any scale extensions. But for circular or watch slide rules it is the diameter & for tubular or drum slide rules it is the overall linear scale length. For other mechanical aids it is the physical length. Ø 12cm
Scales front? Standard (not maker’s) symbols for scales on front face e.g. A = X² (1-100) but § = generic symbol for any non-standard scale + scales between solidi / / are on the slide(s) whereas scales after vertical line | or after reversed solidus \ are on a straight or bevelled top or bottom side edge §,A,D / C,§,§
Scales back? Standard (not maker’s) symbols for scales on back face e.g. S = sine (5° to 90° & 85° to 0°) or sin(x) but § = generic symbol for any non-standard scale + scales between solid / / are on the back of slide(s) but scales listed after / / - notation are on another surface e.g. back of stock or inside a lid §,§ / §
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus two plastic index radials - 1 hairline
Condition? Cn where n = 0-6 based on Herman van Herwijnen’s condition/quality scale C2
Date? YYYY for year(s) of production or an approximation/range of years 1972
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc grey plastic wallet with special plastic information card insert
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed Dutch as part of the information card
Comments ? Any special or noteworthy traits + significant use-related facts + pertinent details of scales/tables in well of stock + any significant tables, etc on the back of the stock

PTT = Posterijen, Telegrafie en Telefonie or old Dutch post, telegraph & phone company + ​NL NR 04 - 2220 = ordering no.

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known <2005/

All of:  ALRO new search?

ModelType
100 R (AC-1.04b) Rietz - early
1010 Commercial (AC-1.18) Business long-scale
200 R (AC-1.05a) Rietz
200 R (AC-1.05a) Rietz - H - early
200 R (AC-1.05a) Rietz - two-tone
200 R (AC-1.05b) Rietz - early
200 R (AC-1.05b) Rietz - green
200 R (AC-1.05b) Rietz - H
200 R (AC-1.05b) Rietz - heavy
200 RL (AC-1.49) Rietz
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