710Ba5101: "N.A. Christensen's steel forms for casting conc[rete] ditches". Ball-peen hammer, spikes, and metal support beam
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Tools rest on burlap or linen cloth. Accompanying note reads, "Pictures of use of in casting experimental sections E. end Hydr. Lab by Herb Schweizer. In 1952, these sections were destroyed when East addition to Lab. was built. Data in Code's files. Civil Eng. Dept"