This post shows the base rim of a straight line embossed CD 132 early Hemingray No. 2 telegraph bullet that was found between in 1973 on the Chicago Northwestern Railroad telegraph line as it ran West out of Boone, Iowa and crossed the Des Moines River toward Ogden, Iowa. Details are as follows:

CD-132 Pat. Dec.19-1871 (Front Dome - Straight Line Embossed) - Small Script 2 (Back Dome - Mold Letter "B") - Aqua-Blue (Unique Rim) - Measurements: 75 mm Wide x 107 mm Height. [id=614524874] [id=614524804] [id=614003064] [id=614003153]

Note: If you have an interest in the CD 132 "No. 2 Telegraph Insulator", the Glenn Drummond article in Crown Jewels (January 2005) pages 30 to 37 is must reading. This article is very technical and describes six generations of Hemingray production and modifications to the insulator design. Using Glenn Drummond's article as a guide the Iowa CD 132's found in Boone Co. are mostly either fourth or fifth generation mold technology - heavier design with or without mold letters, but still suffered from over pour /press over molds. The straight line embossing CD 132 is clearly sixth generation technology which employed new mold design that prevented over pour / press over. This new technology resulted in significantly less waste of glass during the pour. The following post shows the rim of a sixth generation molded CD 132.

The key to identification of a sixth generation mold are the smooth base rim and the two horizontal side mold seam lines on the base as shown in this post.