As early as the 1870's, the Chicago Tribune began using reformed spellings. Joseph Medill, editor and owner, was a member of the Council of the Spelling Reform Association. In 1880 the Chicago Spelling Reform Association met at the Sherman House, and read letters approving the Tribune's efforts. About 50 years later, under Medill's grandson, Robert R. McCormick, and editor James O'Donnell Bennett, the Tribune began a new effort. This "practical test of spelling reform" started in January, 1934, and continued for 41 years, with various changes.
An unsystematic list of 80 respelled words was introduced in four editorials over a two month period, and used thereafter in the paper, which had the largest circulation in Chicago. On January 28, "advertisment, catalog," and seven more "-gue" words were among those shortened. The February 11 list included "agast, ameba, burocrat, crum, missil, subpena." On February 25, "bazar, hemloc, herse, intern, rime, sherif, staf," were among those introduced. On March 11 an editorial reported that "short spelling wins votes of readers 3 to 1." On March 18, the final list included "glamor, harth, iland, jaz, tarif, trafic." An editorial that day, "Why dictionary makers avoid simpler spelling" claimed that they dare not pioneer, "prejudice and competition prevent it." On September 24, 1939, the list was reduced to 40, but "tho, altho, thru, thoro," were added. Addition of "frate, frater," for "freight, freighter," came on September 24, 1945. Changing "ph" not at the start of a word to "f" came on July 3, 1949, with "autograf, telegraf, , philosofy, photograf, sofomore."
In 1970, a new style book was issued which reduced the list substantially, dropping "tarif, sodder, clew, frate," among others. An article in Chicago Journalism Review for September, 1970, reported some reasons for the change: "probably the biggest reason 'is to fall into line with more common practices, especially those taught in college." Five years later, on September 29, 1975, Tribune withdrew from the effort, with an editorial, "Thru is through and so is tho." One reason given was that "the writers of spelling texts would not yield. When Johnny spelled Tribune style, teacher sat him down." They kept the short forms for the "-og" words, and announced that "From now on, Webster's Third will be our guide."
Thus for over 40 years, a substantial proportion of people in the Chicago Metropolitan area have been exposed to a limited but unsystematic list of reformed spellings in daily use. What the effects of the Tribune's spellings have been on the practice of adults in the area seems not to have been studied systematically. Certainly "altho, tho, thru," are more acceptable in that area than elsewhere. A survey of a highschool journalism class in downstate Illinois in 1973 found students favoring "thru" by three to one.
When I was a kid I always thought those spellings were one of the neatest things about the Tribune.