Re: Conical Rivits
Steeple rivet proportions in 1933 are given by this document, a free download:
Miscellaneous Publication 120 Standards & Specifications for Metals & Metal Products, National Bureau of Standards 1933
Downloaded from Google Books; source Stanford University.
Page numbered 142 (162 of pdf)
AMERICAN RAILWAY ASSOCIATION, MECHANICAL DIVISION, RIVET STEEL AND RIVETS FOR LOCOMOTIVE TENDERS AND PASSENGER AND FREIGHT EQUIPMENT CARS, 1925
RIVET STEEL AND CAR RIVETS
PERMISSIBLE VARIATIONS IN GAGE
(Identical with A. S. T. M., A31, given below.)
10. Dimensions of rivet heads. Rivet heads shall conform to the dimensions shown on the purchaser's standard drawings when so specified, otherwise the heads shall conform, within 5 per cent above or below, to the dimensions shown in the accompanying table.
Rivet diameter D
Steeple head rivet: base diameter of head B = 2D
Steeple head rivet: height of head C = D
-- Rufus Cone Bozeman, MT