In Wagner v. Meinzer (1920) 182 Cal. 608, the Supreme Court denied a request to allow the appellant to raise on appeal a claim that the trial judge failed to read findings of fact and conclusions of law before signing it. "We are satisfied that, upon the matters alleged, the claim of the applicant in this behalf could be urged only on motion for new trial on this ground, and only on affidavits setting forth the alleged facts. (Id. at p. 609.)